Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly?

Since you did not give a list of choices,here are some reasons why living cells cannot use heat to provide the activation energy for biochemical reactions:

>Heat can never be used to do work. 
>Heat is not readily available to all living cells. 
>Heat doesn't provide the activation energy for their reactions.

To kill bacteria from our body especially from stomach