Answer:
Pumps, also called transporters, are transmembrane proteins that actively move ions and/or solutes against a concentration or electrochemical gradient across biological membranes. One moves with the concentration gradient (high to low) which powers the movement of the other against the gradient (low to high).
The third one is true. 0.3 > 0.20
<span>a. The length of a giraffe's neck is longer than those in generations of the past.</span>
