Bacteria lack a membrane-enclosed nucleus, in contrast to eukaryotic (true) cells. A area of the cell known as the nucleoid is where the chromosome, a single continuous strand of DNA, is localized but not confined.
The presence of peptidoglycan, which is situated directly outside of the cell membrane, distinguishes the bacterial cell wall from that of all other organisms. An equal number of N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) residues alternate in the polysaccharide backbone that makes up peptididoglycan.
Many eukaryotic cell structures are absent from bacteria. They lack a nucleus, for instance. They also lack organelles that are attached to membranes, such chloroplasts and mitochondria. Bacterial cells have DNA that is distinct from eukaryotic cells.
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Correct Question:
What type of structures would be found in a bacterium, but not in a human cell?
what physical mechanism is produced by a cold
The physical mechanism produced by a cold is a viral infection that triggers an immune response and inflammation in the respiratory tract.
A cold, also known as the common cold, is a viral infection of the upper respiratory tract. It is caused by a variety of viruses, including rhinoviruses, coronaviruses, and adenoviruses. When a person contracts a cold virus, the virus attaches to and enters the cells lining the nose and throat. The virus then hijacks these cells' machinery to replicate itself, causing the infected cells to burst and release more virus particles into the body. As the body's immune system tries to fight off the infection, it produces inflammation in the respiratory tract, which can cause symptoms such as a runny or stuffy nose, cough, sore throat, and sneezing. These symptoms are the body's of trying to expel the virus and its debris from the respiratory tract. In summary, the physical mechanism produced by a cold is a viral infection that triggers an immune response and inflammation in the respiratory tract, leading to a range of symptoms that help the body fight off the infection.
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A ______ is a mound of cells on a solid medium that represents the progeny from one original bacterial cell.
A.) Culture
B.) Colony
C.) Streak
D.) Quadrant
A colony is a mound of cells on a solid medium that represents the progeny from one original bacterial cell. Thus, the correct option for this question is B.
What is the colony of bacterial cells?The colony of bacterial cells may be defined as a group or collections of bacteria that are derived from an identical mother cell. This means that a single mother cell reproduces in order to construct a group of genetically identical cells.
The process of separating a single bacterial cell from other cells and providing it space on a nutrient surface will allow that cell to grow into a mound of cells. This is known as a colony. If formed from a single cell, the colony contains cells from just that species.
Therefore, a colony is a mound of cells on a solid medium that represents the progeny from one original bacterial cell. Thus, the correct option for this question is B.
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43) Protein synthesis in eukaryotes is similar to the process in prokaryotes in that botheukaryotes and prokaryotesA) have exons.B) have introns.C) require snRNPS.D) use methionine as the ""start"" amino acid.E) use codons to determine polypeptide sequences.Answer: E
Protein synthesis in eukaryotes is similar to the process in prokaryotes in that both eukaryotes and prokaryotes use methionine as the "start" amino acid, the correct option is D
Both eukaryotes and prokaryotes use methionine as the first amino acid in protein synthesis. This is because the codon AUG codes for methionine and serves as the "start" codon in both types of organisms. After the initiation codon, the ribosome moves along the mRNA and reads each successive codon to determine the sequence of amino acids in the polypeptide chain. While there are some differences between protein synthesis in eukaryotes and prokaryotes, the use of methionine as the "start" amino acid is a fundamental similarity.
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are mutations occure randomly?
Mutation-induced random variation is used by the mechanisms of evolution, such as natural selection and genetic drift. The rate of mutation is assumed to be influenced by environmental factors, but the direction of mutation is not typically thought to be affected.
Every alteration to the nucleotide sequence in DNA is referred to as a mutation, and it affects both the genotype and phenotype of an organism. Both induced and spontaneous mutations are possible. Mutations can either be advantageous or detrimental. Variation is one of the forces driving evolution, and mutations lead to variety. Nucleotide substitution, insertion, or deletion can result in mutations. Transversion and transition are terms used to describe the replacement of a purine nucleotide with another purine nucleotide or a purine nucleotide with a pyrimidine.
Every mutation need not result in discernible phenotypic alterations. Both good and bad mutations are possible. One of the primary causes of the genetic differences on which natural selection relies is mutation. Moreover, it can result in a number of disorders, such as point mutation-caused sickle cell anemia. Even cancer is caused by them.
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Producers are organisms that make their own food. Producers are any kind of green plant. Which organisms in the Desert Biome Food Web below are producers? (MARK ALL THAT APPLY)
Choices:
bacteria
grass
kangaroo rat
rabbit
hawk
star cactus
cactus
Answer: Grass, star cactus, and cactus.
Explanation: These following organisms/ plants are at the bottom of the food chain and therefore have to make their own food by gathering nutrients from the soil.
Hope this helped you!
Grass, star cactus, and cactus are food web.
What is Desert biome?
The driest biomes are the desert ones. In actuality, a desert's primary distinguishing feature is how little rain it gets. Compared to rainforests, which receive over 2,000 mm annually, most deserts receive less than 300 mm.
Hence, the desert only receives 10% of the rainfall that a rainforest does. Because the air is so dry and heat escapes so quickly at night, the temperature in the desert can vary significantly from day to night.
The average daily temperature is 38°C, while at night, it can fall as low as -4°C in some desert regions. The location of the desert has a significant impact on the temperature as well.
Therefore, Grass, star cactus, and cactus are food web.
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The movement of matter due to differences in density is called convection. When denser material sinks, less dense material around it is pushed up. Convection also describes the transfer of energy due to the flow of matter. Convection can happen in gases, in liquids, and in solids that flow slowly. In the Earth system, convection happens in the atmosphere, in the ocean and other bodies of water, and in rock deep inside Earth. A convection current forms when convection happens repeatedly or in a cycle.
The motion of matter due to differences in density is called convection. When denser material sinks, less dense material close to it is pushed up.
What do you mean by convection ?Heat is transferred by convection, which is the large-scale movement of molecules inside gases and liquids. Conduction is used to move heat from the object to the fluid initially, but fluid motion is responsible for the bulk of the heat transfer.
Convection can occur in gases, in liquids, and in solids that flow slowly. A convection current produced when convection occurs in a cycle.
Thus, The movement of matter due to deviations in density is called convection.
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Your question is incomplete, most probably your question was
From the above paragraph, What do you mean by the term convection ?
smallest bones in the body
The stapes
Explanation:
the smallest bone in the body .
Which one of the following statements about endocytosis is incorrect? A)Endocytic vesicles can be formed when a receptor molecule binds a specific cargo molecule. B)All cell types are capable of phagocytosis, a form of endocytosis. C)Internalization of extracellular fluid is a form of endocytosis. D)Endocytosis is an invagination of the plasma membrane. E)All of these statements about endocytosis are correct.
Option b) All cell types are capable of phagocytosis, a form of is one of the following statements about endocytosis is incorrect endocytosis.
In biology, what is endocytosis?Christian de Duve invented the word "endocytosis" in 1963 to describe both the absorption of big particles (such as bacteria) and the uptake of fluids or macromolecules in small vesicles. The former is known as phagocytosis (cell devouring), whereas the latter is known as pinocytosis (cell drinking).
Endocytosis is a biological mechanism that allows chemicals to enter the cell. The material to be internalized is surrounded by an area of cell membrane, which then buds off inside the cell to form a vesicle containing the ingested material.
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Which small proteins serve as a means of communication between immune system cells?
Little proteins called cytokines act for the purpose of correspondence between immune system cells.
The Cytokines can likewise be called little proteins. They follow up on the insusceptible framework as a reaction to antigenic improvement and capability as a substance courier between cells of the invulnerable framework, permitting different cells to perceive what's going on and to accurately act.
The different cells of the versatile insusceptible framework convey either straightforwardly or by means of dissolvable synthetic couriers like cytokines (little proteins). These substance couriers are for the most part proteins and are delivered by various cells in the body.
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An organism's genetic makeup, or allele combinations. (the actual alleles an individual inherited from their parents)Choose matching terma. allelesb. homozygousc. genotyped. recessive
The Ambystoma tigrinum and Ambystoma maculatum are 2 types of salamanders. Ambystoma represents which taxonomic level?
Answer: he presence of neotenic populations near those with large larvae has made it difficult to identify mole salamander species. The tiger salamander complex was previously considered a single species ranging from Canada to Mexico, falling under the name A. tigrinum. Despite differences in coloration and larvae, tiger salamanders were found throughout their unbroken range, which made it difficult to delineate subspecies, let alone elevate any populations to species status. In morphological terms, tiger salamanders are all very similar, with large heads, small eyes, and thick bodies. This is probably because tiger salamanders have the primitive morphology of mole salamanders. They are also the largest of the mole salamanders and have very large larvae. All populations have similar lifestyles, and their lifecycles are identical. However, when one looks at tiger salamander populations distant from each other, different species within this complex become apparent. The ranges of these potential species overlap, and hybridization occurs, blurring the lines between species.
Explanation:
Answer:ur mum
Explanation:
Which process is directly responsible for the synthesis of adenosine triphosphate molecules?a. digestionb. excretionc. respirationd. circulation
Respiration is the process which is responsible for synthesizing ATP or the adenosine triphosphate.
The correct option is option c.
Cellular respiration or respiration is basically defined as a series of chemical reactions which happen to break down the glucose in order to produce the ATP, which is then used as a source of energy by the cells which are present in our body in order to power a number of reactions reactions throughout the body.
There are three major steps which occur during cellular respiration. These steps are glycolysis, the citric acid cycle, as well as the oxidative phosphorylation.
Hence, option c is correct.
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What is an action potential in simple terms?
A rapid series of voltage changes across a membrane is known as an action potential. The relative ratio of extracellular to intracellular ions and the permeability of each ion together at any given time determine the membrane voltage, or potential.
A membrane's voltage rapidly changes in a series of steps known as action potentials. The permeability of each ion and the relative ratio of extracellular to intracellular ions both affect the membrane voltage, or potential, at any given time. The activation of sodium ion channels within the plasma membrane of neurons causes the rapid rise in potential, known as depolarization, which is an all-or-nothing event. The activation of potassium ion channels then causes the cell to repolarize, returning to resting potential. An ATP-driven pump (Na/K-ATPase) causes passage of sodium ions out of the cell and potassium ions into the cell in order to restore the proper ionic equilibrium.
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Which of the following statements regarding G-protein coupled receptors (GPCRs) are true?(Select all that are true.)A. The GPCR is a tyrosine kinase.B. The trimeric G-protein becomes inactivated upon binding to the GPCR.C. The GPCR functions as a dimer.D. The GPCR associates with a trimeric G-protein.E. The GPCR is activated without binding to ligand.
The appropriate response is D. (The GPCR associates with a trimeric G-protein). Usually, upon ligand binding, the GPCRs are able to link up with trimeric G-proteins and activate them.
Receptors characteristics The transmembrane cell surface receptors known as G-protein coupled receptors (GPCRs) have a wide range of ligands and varying effects on a number of activities. There are about 800 different varieties of GPCRs. G protein-coupled receptors (GPCRs) mediate the majority of cellular responses to external stimuli, including light, odors, hormones, and growth factors. Due to their prevalence and physiological roles, the GPCRs are the target of up to 50% of the drugs marketed in the U.S. GPCRs are integral membrane proteins that have seven TM -helices.For more information on G-protein coupled receptors kindly visit to
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what type of fat contains an unusual bond that does not occur naturally?
Trans-fats contains an unusual bond that does not occur naturally but occurs as a result of an industrial process.
Trans-fats contain an unusual bond resulting from a industrial process called hydrogenation. These types of days are a kind of unsaturated fatty acids that possess hydrogen bonds on the opposite sides of the carbon atom unlike cis-fatty acids. This gives them a more linear structure. Usually unsaturated fatty acids lack a linear structure and are bent molecules.
Hydrogenation is the process of addition of hydrogen to the carbon-carbon double bonds in order to make them lose this double bond and become saturated. Moreover, hydrogenation process is also used to make trans-fats industrially. Trans-fats have an unusual shape due to partial hydrogenation often but have similar properties as those of saturated fats.
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Enzymes accelerate a reaction by making the δg more favorable. True or False?
The given statement that "Enzymes accelerate a reaction by making the δg more favorable" is true because enzymes accelerate a reaction by lowering the activation energy required for the reaction to occur. they achieve this by stabilizing the transition state of the reaction, which reduces the energy needed to reach that state
Enzymes lower the activation energy required for a reaction to proceed, which in turn makes the Gibbs free energy change (ΔG) more negative and therefore the reaction more favorable. By lowering the activation energy, enzymes make it easier for reactants to overcome the energy barrier and form products.
As a result of this lower activation energy, the Gibbs free energy change (ΔG) for the reaction becomes more negative, making the reaction more energetically favorable. This means that the reaction can occur more quickly and with a greater yield of products.
Therefore, enzymes can accelerate reactions by making the ΔG more favorable.
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select the findings of erwin chargaff regarding dna composition. Check all that apply -A= T -C= T -G= C -G =A -pyrimidines =purines
The correct findings of Erwin Chargaff regarding DNA composition are:
A = T- G = C
What are Erwin Chargaff's rule?Erwin Chargaff's rule, also known as Chargaff's ratios, refers to the regularity in the base composition of DNA. Chargaff's rule, which he discovered through the analysis of DNA from various organisms, states that the amount of adenine (A) in DNA always equals the amount of thymine (T), and the amount of guanine (G) always equals the amount of cytosine (C). This means that A and T, and G and C, are complementary base pairs that are held together by hydrogen bonds.
Chargaff's rule is significant because it provided critical information for the discovery of the double helix structure of DNA by Watson and Crick. The base pairing rules that Chargaff observed led Watson and Crick to propose that DNA consists of two complementary strands that run in opposite directions, with the base pairs connecting in the middle to form the rungs of a ladder-like structure.
Chargaff's rule is also important in DNA analysis and genetic research, as it is used to determine the amount of each base in a DNA sequence. This information is then used to help identify genetic mutations, design primers for DNA amplification, and perform other molecular biology techniques.
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what are the eleven body systems
The integumentary system, muscular system, lymphatic system, respiratory system, digestive system, neurological system, endocrine system, cardiovascular system, urinary system, and reproductive system are among the 11 organ systems.
There are eleven organ systems in the human body. The immune system, skeletal system, muscular system, nervous system, endocrine system, cardiovascular system, lymphatic system, respiratory system, digestive system, urinary system, and reproductive system are among them (Female and Male). The most important organ system in the human body is the nervous system, which connects to the brain and is as important as your heart. Every action and movement that your body takes is coordinated by the neurological system of the human body.
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Bone plays a central role in the regulation of blood levels of A) potassium. B) iron. C) sulfate. D) calcium. E) sodium.
Bone plays a central role in the regulation of blood levels of calcium.
The correct option is D.
What is the role of the bone in the regulation of blood levels of calcium?The bones play an important role in the regulation of blood levels of calcium through a process called bone remodeling, which is the continuous turnover of bone tissue.
When the blood calcium level is low, parathyroid hormone (PTH) is released by the parathyroid gland. PTH stimulates osteoclast activity, leading to an increase in bone resorption and the release of calcium into the bloodstream.
When the blood calcium level is high, the thyroid gland releases calcitonin, which inhibits osteoclast activity, leading to a decrease in bone resorption and the deposition of calcium into the bone matrix.
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Select the findings of Erwin Chargaff regarding DNA composition. A =TC= T G=C G=A pyrimidines = purines
Pyrimidines = Purines, A=T G=C. Nucleotide bases (A) and thymine (T) & guanine (G) to nucleotides (C) ratios in DNA are equal, according to Erwin Chargaff's research. The ultimate DNA structure makes this parity clear.
He discovered that amounts of adenine, thymine, cytosine, and guanine in DNA were essentially the same in 1950. Later, this was referred to as the first Chargaff rule. He received the Dreyfus Medal (1949) the the Medal of Science, among other distinctions (1974). Chargaff initially observed that DNA, whether it was extracted from a plant or an animal, contained the same amounts of adenine, thymine, and cytosine and guanine. The molecular couplings that make up a double helix were revealed by these equalities. Adenine always couples with thymine, and nucleotides always pairs with guanine, according to one of Erwin Chargaff's laws.
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what is the name of the blood cell responsible for blood clotting?
Blood clotting is caused by blood platelets. The platelets alter their appearance and get stickier.
As a result, they can adhere to the vascular wall and group together to form a plug. A blood clot develops. In order to prevent unnatural blood clots, clotting enzymes in the blood are often turned off. Whenever a blood vessel gets injured, coagulation, or blood clotting, plays a crucial role in limiting the amount of bleeding that occurs. Your plasma, which is the liquid component of your blood, contains proteins and platelets, which work together just to stop bleeding by building a clot so over wound. The body sends the signal to platelets that direct them to the affected location when a blood artery is damaged.
(Which blood cells are involved in blood clotting process?
A. Platelets
B. WBC
C. RBC
D. Plasma)
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what role does atp hydrolysis play in the function of the proteasome?
what is a characteristic of colostrum?
Both fish and people are considered to be vertebrates in terms of evolution. More than 500 million years ago, the earliest vertebrates existed. They looked like colostrum, hagfish.
As new fish classes emerged, they evolved characteristics including a whole vertebral column, jaws, and a bony endoskeleton. In addition to being the first vertebrates to live on land, amphibians were also the first tetrapod vertebrates. The five common classes of fish, amphibians, reptiles, mammals, and birds make up the phylum chordata (animals having backbones).
Using these groupings as examples, describe the traits that set each apart from the others. Ostracoderms, a group of agnates, were the ancestors of all vertebrates. They possessed a variety of Craniatan traits. They fed on filters and had a strong pharyngeal pump that pumped water into their mouths.
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hermaphroditism group of answer choices is primarily an adaptation for self-fertilization. evolved in barnacles and snails because of their limited mobility. evolved before anisogamy refers to the ability to reproduce without sex. means having only one kind of gamete (sex cell).
Answer:
primary cell
Explanation:
the primary cell the right answer
The sugars associated with glycoproteins and glycolipids of animal cell membranes _____.
a. maintain membrane fluidity at low temperatues
b. decrease membrane fluidity at high temperatures
c. serve as an energy source for the cell
d. serve as markers that distinguish one cell from another
D. serves as a marker that distinguishes one cell from another
What is an animal cell?
An animal cell is a type of eukaryotic cell that does not have a cell wall and contains a true, membrane-bound nucleus and other cellular organelles."
The size of animal cells ranges from a few microscopic microns to a few millimeters. The ostrich egg is the largest known animal cell, measuring over 5.1 inches across and weighing about 1.4 kilograms. This starkly contrasts the human neuron, which is only 100 microns across.
Animal cells vary in shape as well, with some being flat and others oval or rod-shaped. Animal cells are eukaryotic cells with a nucleus that is bound to a membrane, as was previously mentioned. Furthermore, the nucleus of these cells shows evidence of DNA. They also include additional cellular components, such as membrane-bound organelles that perform particular tasks essential to a cell's health.
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what do porifera (sponges), ctenophora (comb jellies) and cnidaria (jellyfish, corals, anemones, and hydroids) have in common regarding symmetry?
Answer:
They are non-bilaterian.
Explanation:
All the animals you listed are non-bilaterian; any organism that lacks bilateral symmetry is non-bilaterian, which is what all of those have in common.
Is a wedge tailed eage a tertiary consumer?
Wedge tailed eagle. A carnivore (tertiary consumer) but also a scavenger. This is the largest bird of prey in Australia. The apex predator in this food web.
What is scavanger?
Around the world, several animals that scavenge experience persecution. [Reference needed] Particularly vulnerable to human threats and harassment are vultures. The veterinary medication Diclofenac caused at least a 95% reduction of Gyps vultures in Asia before it was outlawed by regional governments in 2006. Due to the expanding human population, overhunting of vulture food supplies, modifications in cattle husbandry, and habitat loss, vulture species have declined in West Africa. The practise of poisoning some predators to enhance the quantity of game animals is still widespread in European hunting and causes poisoning in vultures when they eat the poisoned predators' carcasses.To know more about scavanger, click the link given below:
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plants and some other organisms that use photosynthesis to produce their own food internally are know as
Autotrophs are plants and some other organisms that produce their own internal food through photosynthesis. The correct answer is option (a).
An autotroph is a creature that can produce allure own meal utilizing light, water, colorless odorless gas, or added projectiles for weaponry. Because autotrophs produce their own food, they are consistently named builders. Plants are the ultimate intimate type of autotroph, but skilled are many various types of autotrophic creatures.
Photosynthesis is a process secondhand by plants and additional animals to convert light strength into synthetic strength that, through basic breathing, can later make public to fuel the structure's projects. They use the process of photosynthesis to mutate water, light part of 24 hours, colorless odorless gas into oxygen, and natural sugars that the plant uses as fuel. These basic builders form the base of an environment and fuel the next trophic levels. Without this process, history on Earth as we see it would not be likely.
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The complete question is:
Plants and some other organisms that use photosynthesis to produce their own food internally are known as:
a) autotrophs
b) heterotrophs
c) producers
d) consumers
what are some drawbacks to using biometrics for authentication? check all that apply.
Disadvantages of biometric authentication:
Expenses - Substantial expenditure is required in biometric security. Data breaches: It's still possible to hack into biometric databases.Tracking and data - Biometric technologies, such as facial recognition systems, might restrict users' privacy.Pfishing attacks are not successful. One-time password generators make it possible for phishing to steal the one-time password, along with the username and password. It is possible to prove beyond a reasonable doubt that a person is who they claim to be through authentication.
This verification is carried out by specific biological or behavioral traits being checked in biometric authentication. The process of authenticating someone or anything involves confirming that they are, in fact, who or what they claim to be. By determining whether a user's credentials match the credentials, authentication technology controls access to systems.
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Correct Question:
What are some drawbacks to using biometrics for authentication?
Who protect spinal cord
Skin lungs heart. Backbone
The backbone protects the spinal cord.
The central nervous system of the human body is made up of the lengthy, delicate, and crucial spinal cord. It passes through the spinal column, which is made up of separate bones called vertebrae, as it descends from the base of the brain. To move, experience sensations, and regulate bodily processes, messages must travel through the spinal cord from the brain to the rest of the body.
The spinal cord is shielded from harm by the vertebrae of the backbone. They are layered on top of one another and protected by pliable, supple discs that provide flexibility and stress absorption. Together, the vertebrae create a sturdy and adaptable structure that protects the spinal cord and supports it while also enabling optimal movement and function. The spinal cord would be fragile without the support of the backbone, which could have detrimental effects on a person's health and welfare.
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The complete question is-
Who protects the spinal cord?
A) Skin B) lungs C) heart D) Backbone
