Question

what do all cellular activities in living organisms use as a source of energy?
atp
lactic acid
pyruvic acid
carbon dioxide

Explanation:

ATP (adenosine - triphosphate) is known as the energy - currency of the cell. It provides the energy required for various cellular activities such as muscle contraction, active transport, and biosynthesis. Lactic acid is a product of anaerobic respiration, pyruvic acid is an intermediate in cellular respiration, and carbon dioxide is a waste product of cellular respiration.

Answer:

ATP