How does the number of fossils change from the Permian to the Triassic periods in the rock layers?

there’s no image attached but i can if you want: )

substitution is the answer in this case

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.