Question

which life processes are essential for production of energy required by body​

Answer 1

The basic essential activities performed by an organism to withstand its life are called as life processes. These include nutrition, respiration, circulation, excretion and reproduction. Organisms obtain energy from food to perform these life processes which are essential for survival.

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Answer 2

$\bold{Respiration}$ and $\bold{Digestion}$ are the $\bold{life\:processes}$ are $\bold{essential}$ for $\bold{production}$ of $\bold{energy}$ required by body