It occurs continuously in the cells of all organisms and often involves an exchange of gases. There are 2 types of cells, 1 is Eukaryotic, which holds a nucleus, and the 2nd is Prokaryotic, which do not. Prokaryotes are single-celled organisms.
the answer is ATP. ATP is the bi- product that cells can easily absorb 4 energy. the body digests the glucose first, whatever is left after that is ATP..