I'll answer number 3 for you.
Which are decomposers within a spruce-fir forest ecosystem?
the answer is mushrooms.
Some mushrooms are known for growing over dead things..... I think.
is there more information?
Im not sure how to answer this since there were no choices given but I will answer by telling you what nuclear fusion is...
so basically nuclear fusion is the merging or combining of 2 isotopes, typically isotopes of hydrogen, under conditions of extreme temperature and pressure thus resulting in the release of massive amounts of energy. I think the answer to your question would be new types of electricity because the heat emitted from the reaction could be turned into electricity by using its steam. This is what happens in nuclear reactors
i hop this answers your question
I would say, no it gets colder because you become exposed to space where heat isn’t trapped in
So that they don't explode.
AKA with a thing called osmosis (transportation of water through cells.)