Which of the following is a function of the plasma membrane? Breaks down lipids, carbohydrates, and proteins from food.
Stores water, salt, proteins, and carbohydrates.
Keeps the cell wall in place.
Regulates which materials enter and leave the cell.

The answer is 4th one as I think

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

the answer to your question is b