Question

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

Explanation:

Cellular activities in living organisms use ATP (adenosine triphosphate) as a source of energy. ATP is the energy currency of the cell, and processes like metabolism, movement, and synthesis rely on it. Lactic acid is a by - product of anaerobic respiration, pyruvic acid is an intermediate in cellular respiration, and carbon dioxide is a waste product of respiration, so they are not the energy source for all cellular activities.

Answer:

A. ATP