A group of the same cells working together make up tissues. Two or more tissues working together make up the of organization. Options:
-tissue level
-organ level
- organ system level

the answer is b)3/8x+1

i think that it is plants

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.