Each atom wants to follow the octet rule and have eight electrons in the valence
Cell differentiation is your answer
Respiration is an exergonic reaction. An exergonic reaction is one in
which energy is released, and as a result the products of this reaction
will have less energy than the original products. Cellular respiration
can also be referred to as a catabolic pathway, which means bigger
molecules get broken down into smaller molecules and therefore there is
extra energy at the end of the reaction.