The best answer would be enzymes since they are protein molecules and help build it. Enzymes also take part in reaction.
The answer is D its tightly packed cells allow for proctection against harmful substances.
Answer:
C
Explanation:
Cellular respiration is the aerobic process by which living cells break down glucose molecules, release energy, and form molecules of ATP. Overall, this three-stage process involves glucose and oxygen reacting to form carbon dioxide and water.
