What statement is true about natural selection and evolution A. Evolution is the mechanism by which natural selection occurs

B. Natural selection and evolution both show change over time

C. Evolution and natural selection occurs separately in an ecosystem.

i don’t no. suiopgohjk

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.