. It occurs in living cells only. . It does not occur in living cells.
. It is a slow process. . It is a fast process.
. It occurs at body temperature. . It occurs in high temperature.
. No flame and smoke is seen. . It is accompanied by flame and smoke.
. It occurs in a series of steps. . It occurs in a single step.
. Energy is released in steps. . Energy is released spontaneously.
Hope it helps.. :)