I think the answer is recognition proteins!
It increases..................
A community is where a group of people live really close by vs. a population counts how many people live in a area
Answer:
Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.