Which of the following is an example of an exothermic process?

melting

boiling

freezing

evaporating

The answer to the question above is letter a. melting.

>Exothermic is the giving off heat energy the  transfer of energy to the surroundings.

>In exothermic reaction, the energy is usually transferred as heat energy

> Other example of exothermic is combustion

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the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.