Im pretty sure that it is the letter ::::A ..
hope this helped xoxo
I believe that a cell must use active transport to move molecules across the membrane against a gradient. Your answer should be D.
Effective teamwork and high productivity are good indications of positive
productivity goals.
Explanation:
Explanation: The electron transport chain generates the most ATP out of all three major phases of cellular respiration. Glycolysis produces a net of 2 ATP per molecule of glucose.
Ans: Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.