Why is the cell membrane often called the plasma membrane?

The plasma membrane, also called the cell membrane, is the membrane found in all cells that separate the interior of the cell from the outside environment.

Explanation:

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

c. live where it’s cold and icy