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Answer 1

The scratches on the bedrock suggest that the continents were once connected nearer to the South Pole and the ice flowed from the sea onto the land.

In some of the locations, the scratches as well as the grooves which are present on the bedrock and the glacial debris basically showed that the ice must have moved from what is now from the sea onto land and it is usually very unlikely for the large continental glaciers to be able to move from the sea and then onto land.

Earlier the continents were found to be more connected towards the South Pole and South America, South Africa, India, Australia etc. were one covered with ice sheets.

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Which of the following changes in the plasma me

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The change to the plasma membrane would most likely increase membrane fluidity in humans is the decreased lipid raft content (option B).

What is plasma membrane?

Plasma membrane is the semipermeable membrane that surrounds the cytoplasm of a cell. Plasma membrane fluidity is a parameter describing the freedom of movement of protein and lipid constituents within the cell membrane.

The factors that affect the fluidity of the plasma membrane are as follows:

temperaturecholesterolthe kind of fatty acids in the phospholipids that form the cell membrane.

An increase in the cholesterol concentration generally decreases membrane fluidity, which is why lipid rafts have a much higher concentration of cholesterol than the surrounding membrane. This means that decreasing cholesterol content would make the membrane more fluid.

The complete question is as follows;

Which of the following changes to the plasma membrane would most likely increase membrane fluidity in humans?

A) Increased saturated fatty acid content

B) Decreased lipid raft content

C) Decreased phosphatidylcholine content

D) Decreased unsaturated fatty acid content

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