<span>This theory is called punctuated equilibrium. In this theory it is explained that there are very long periods of no change at all to a species, yet there are also bursts of evolutionary change interspersed within the time period. The period of remaining the same throughout time (most of the time) is called stasis, and is present within this theory of punctuated equilibrium.</span>
five ways in which a membrane can deal with the materials are:
1. it keeps molecules out
2.allowing molecules to enter anytime.
3.sometimes it allow molecules at certain times.
4.hydrophobic molecules can go with ease because it can dissolve in the lipid bi layers.
5.large external materials can be taken by the cell through endoctytosis.
Answer:I'm almost positive the answer is A
Explanation: