Answer:
1. Concentration of O2 in the alveoli must be more than that of the blood
2. Concentration of CO2 in the blood must be more than that of the alveoli
3. Movement does not stop (find the explanation below).
Explanation:
Gaseous exchange i.e. taking in of O2 and taking out of CO2, takes place in the alveoli/air sac of the lungs. However, the movement in and out of O2 and CO2 from the alveoli into the bloodstream and vice versa follows the principles of SIMPLE DIFFUSION. Diffusion is the process whereby substances move from a region of high concentration to a region of low concentration until they are evenly distributed. Based on this, the following will occur:
1. The concentration of O2 in the alveoli must be more than that in the blood in order for oxygen to enter the blood via diffusion.
2. The concentration of CO2 in the blood must be more than that in the alveoli in order for carbon dioxide to leave the blood and enter the alveoli via diffusion.
3. When the rate of diffusion is at equilibrium i.e. no net movement is occuring die to equal concentration of the substance on both sides, the substances begin to move in the opposite direction at an equal rate. Note that, at equilibrium, MOVEMENT DOES NOT STOP, however, there is an equal rate of movement.
ASAP I WILL MARK BRAINLIST
When will natural selection occur?
A.When there is no competition
B.When there is limited food
C.When there are plenty of resources
D.When there is no genetic variation
Answer:
B
Explanation:
Natural selection occurs when there is competition, limited food. Thus A and C are wrong. D is also wrong, genetic variation has major influence.
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Answer:
b
Explanation:
Some volcanoes have the potential to affect the entire Earth
True or False
Answer:
True
Explanation:
An example could be the Yellowstone supervolcano; if it erupts, it has the potential to have a massive affect on the planet.
Have a nice day ^-^
How does melting glaciers affect the water cycle
Answer:
According to the National Snow and Ice Data Center (NSIDC), if all glaciers melted today the seas would rise about 230 feet (70 meters). During the last ice age (when glaciers covered more land area than today) the sea level was about 400 feet (122 meters) lower than it is today.
Explanation:
What is the function of ribosomes?
a
Ribosomes build mRNA
b
Ribosomes build tRNA
c
Ribosomes build proteins
d
Ribosomes build DNA
e
Ribosomes build rRNA
Answer:
b
Explanation:
True or false, a battery like a duracell or energizer battery stores the energy we get from it as nuclear energy? True False
Answer:
true
Explanation:
My guess would be false, sorry if I'm wrong.
Which of the following are likely to form an ionic bond?
O copper atoms
o hydrogen and oxygen atoms
O copper and fluorine atoms
hydrogen atoms
This is urgent; please answer quickly.
Answer:
The correct answer is option C. the movement of water from the central vacuoles of the cells into the solution.
Explanation:
In the given question onion cell was initially in 1% NaCl solution later student increase the concentration of the NaCl in the solution which makes the solution hypertonic.
A hypertonic cell is a solution with less water or more solute. Increasing salt concentration makes solute concentration high than inside the cell. Cell shrink in this case due to the osmosis or water movement from the high concentration region of water to the low concentration of water region.
Your skin cells and muscle cells have different characteristics. Finish this statement: The proteins in your skin cells and muscle cells are
a
the same
b
different
Answer:b
different
Explanation:
please help me frfrfr
Answer:
Sexual reproduction
Explanation:
Dud this in Biology last year in 9th grade
help please and thank you.
When comparing animal to plant cells, they are different in size, shape, and how they store energy. They have similarities, as well. Which organelles perform similar functions in both plant and animal cells. Group of answer choices D. Ribosome, cell membrane, chloroplast C. Cell membrane, cell wall, nucleus
Answer:
ribosome, cell membrane, nucleus
Explanation:
The organelles that perform similar functions in both plant and animal cells among the listed organelles would be the ribosome, the cell membrane, and the nucleus.
First of all, chloroplast and cell wall are limited to the plant cell only. Animal cells do not have these organelles.
The ribosome functions as the site of protein synthesis in both plant and animal cells. The cell membrane acts as a channel for the control of the movement of materials in and out of the cells and is found in both plant and animal cells. The nucleus is also present in both cells and serves as the control unit of the cell by housing the genetic materials and dictating how the cells will behave.
NEED HELP!!!
In a certain species of plant, flowers can be purple or white. When a plant with white flowers (P 1) is crossed with a plant with purple flowers (P 2), all offspring have purple flowers (F 1).
a. Determine which trait is dominant and recessive, and prove it with a Punnett square.
b. Show a Punnet square for a cross that allows F 1 to self-pllinate.
Answer:on part A,the white trait is recessive,and the purple trait is Dominant.
Explanation:
What is the purpose of DNA replication in the cell cycle?
O A. to replace old DNA
O B. to increase genetic diversity
OC. to have two copies of each chromosome
OD. to help the cell grow larger
Plweassse answer for me
Answer:
1 e
2 d
3 b
4 a
5 c
Because the DNA is being recombined with other DNA.
The image shows a mountain peak in Asia.
A snow covered mountain top.
Which force most likely created this mountain?
compression
gravity
shearing
tension
Answer:A- compression
Explanation:
Answer: a
Explanation:
took test
What is artificial selection?
A.When a new allele is formed by mutation
B.When humans breed an animal for a certain trait
C.When extreme traits are selected by nature
D.When 60 percent of a species dies at one time
The answer is B since that's the definition of artificial selection ,selective breeding made by humans
What is the building block of all living things?
Answer:
cell
Explanation:
is a building block of living things
Compare and contrast the various types of grasslands.
There are two main kinds of grasslands: tropical and temperate. Examples of temperate grasslands include Eurasian steppes, North American prairies, and Argentine pampas. Tropical grasslands include the hot savannas of sub-Saharan Africa and northern Australia.
Hope this helps!
What factor determines the pathway that pyruvic acid takes after leaving glycolysis?
Answer:
Explanation:
Answer Expert Verified. The presence of oxygen and levels of ATP.
3. Why is it easy to describe an organism's phenotype for a particular characteristic but
very difficult to state the genotype?
Answer:
The sum of an organism's observable characteristics is their phenotype. A key difference between phenotype and genotype is that, whilst genotype is inherited from an organism's parents, the phenotype is not. Whilst a phenotype is influenced the genotype, genotype does not equal phenotype
If you were to test a small
sample of soda lime with
universal indicator would it
register a pH above or
below 7? Explain your answer
The soda contains CO2 that is dissolved CO2 reacts with water
CO2+H2O--->H2CO3
to form carbonic acid
this is a weak acid but it gives protons to water
H2CO3+H2O-->-HCO3+H30+
pH=-lg[H3O+]
[H3O+] is the molar concentration
Therefore the acid present in the solution causes the pH to be lower than 7. It can either be the H2CO3 if it is a carbonated beverage or citric acid from lime juice.
Scientific explanations are usually based on
O A fixed set of steps and procedures
O logical reasoning only
O evidence only
O logical reasoning and evidence
Answer:
A fixed set of steps and procedures
What will happen to a protein when the DNA codes for a different amino acid?
If a mutation occurs in the DNA let's say a point mutation only one of the base pairs will be different. The codon will be different so a different amino acid will be synthesized. Amino acids have different radicals with different functional group. Those radicals that differ from amino acid to amino acid determine the shape and function of the protein. Therefore a mutated gene will cause the synthesis of a protein with an altered shape and function. A good example is sickle cell disease. Where glutamic acid is replaced with valine and the beta chain of hemoglobin has a deformed shape and has an altered function(carries less oxygen).
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Which of these organisms would most likely be found at the top of an energy pyramid?
A. clams - a primary consumer
B. sardines - a primary consumer
C. sharks - a secondary consumer
D. kelp - a primary producer
Answer:
sharks
Explanation:
Because they are the ones to get the last bit of energy. Secondary consumers are the group in the food chain that eats primary consumers. This means that secondary consumers can either be omnivores or carnivores. These terms refer to whether or not they eat just meat or a varied diet. Secondary consumers don't need to have a specific diet.
The energy pyramid is a representation of the producers and consumers along with the flow of energy. The sharks will be at the top of the energy pyramid. Thus, option C is correct.
What is an energy pyramid?An energy pyramid is a graphical representation of the biomass of the producers and the consumers of the ecosystem. It consists of the trophic levels that have designated producers, primary consumers, and secondary consumers.
A producer is at the bottom of any energy pyramid as they produce the foods for the primary consumers that are most likely herbivores. The secondary or the tertiary consumers are at the top.
Therefore, option C. sharks being secondary consumers are at the top of the pyramid.
Learn more about energy pyramids here:
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GUYS PLEASE HELP!!!!!
The models represent the stages of the cell cycle in the random order.
in
M
VI
Which stage of the cell cycle shows the formation of spindle fibers and chromatin condensing into chromosomes?
OL
O V
M
IV
Please Answer this one MCQ. I am in trouble please help ..
Answer:
H is a motor nueron
J is the sensory nueron
G is the internueron
Explanation:
Your drawing seems a little bit of so I hope I get it right!. I know that Relay neurons are found in the brain and spinal cord and allow sensory and motor neurons to communicate. Motor neurons are found in the central nervous system and control muscle movements.
During which two months do both the Northern and Southern Hemispheres receive the same amount of energy from the Sun?
Answer:
in March and September
Explanation:
it is
Answer:
its c
Explanation:
they both get the same amount of sun
are based on common human or environmental properties, such as
population, average temperature, and political boundaries,
O A. Physical regions
O B. Functional regions
O C. Perceptual regions
D. Formal regions
The jellylike substance that holds everything in place inside all cells is called the....
Answer:
Cytoplasm
Explanation:
Answer:
Cytoplasm
Explanation:
Cytoplasm is the semi fluid gel like substance of a cell that is present within the cellular membranes and surrounds the nucleus.
(I need help on math so pls lmk if your willing to help)
