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 releases energy when its high - energy phosphate bonds are broken. Lactic acid is a by - product of anaerobic respiration in some cells. Pyruvic acid is an intermediate in cellular respiration pathways. Carbon dioxide is a waste product of cellular respiration.

Answer:

ATP