On the polygenic tree which two species or group together?
A) cichlid and frog
B) frog and coelacanth
C) cichlid and coelacanth

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.