Can somebody give me the answer to this ?

That`s tough for me to answer, but the definition is to retain, or require heat or energy to make a function of process. I would think it is fireworks, because a chemical reaction is required to produce the effects, but each answer retains heat in some way. I would still choose fireworks though. Hope that helps . . .

its going to be mutualism cuz they both benefit from the relationship.

~batmans wife dun dun