What do all cellular activities in living organisms use as a source of energy? atp lactic acid pyruvic acid dna

All cellular activities in living organisms use ATP as their source of energy. ATP is the shortened form of Adenosine Triphosphate. It is a nucleotide which is often referred to as the molecular unit of currency of intra-cellular energy transfer. It is produced during the process of cellular respiration, it is required in all living cells as a source of energy to be used in the processes which keep the organism alive.