What happens during each of the two stages of cellular respiration.

In the first stage of cellular respiration, molecules of glucose are broken down into smaller ones, but without the use of oxygen. In the second stage, those molecules that were broken down, are transformed into even smaller molecules, but with the use of oxygen, and a great release of energy as a result

Explanation:

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explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.