Answer:
when a concentration gradient exists and more of the substance is on the inside of the cell
Explanation:
Active transport moves substances against the concentration gradient, from an area of low concentration to an area of high concentration. It requires the use of energy, usually in the form of ATP.
Hope that helps.
I believe this would be the ribosomes <span />
C. An amoeba is most likely to use pseudopods
<span> (4) A–organelles; B–organs works since organelles make up cells and organs make up organ systems.</span>
