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 tri - phosphate) is the energy - currency of the cell. It provides the energy for various cellular activities through hydrolysis to release energy stored in its high - energy phosphate bonds. Lactic acid, pyruvic acid are involved in metabolic pathways but not the direct energy source for all cellular activities. Carbon dioxide is a by - product of some metabolic processes, not an energy source.

Answer:

A. ATP