Which best describes how the fossil record supports the theory of evolution? the fossil record shows exactly how all species have evolved. the fossil record refutes darwin's theories. the fossil record cannot accurately be aged. the fossil record reveals intermediates that link different species.

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.