White rabbis blend in with the snow. brown rabbits are more likely to be eaten by predators. is the population of rabbits in genetic equilibrium?

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.