Please help!What are the roles of a decomposer? Check all that apply.

Decomposers kill harmful microorganisms.
Decomposers break down waste and dead organisms.
Decomposers provide oxygen to the atmosphere.
Decomposers convert sunlight into food energy.
Decomposers recycle nutrients in the environment.

decomposer decomposes :) so it breaks down the organic matter into simpler compounds. it's very important process because complex compounds that build living organisms are not absorbable for other organisms, thus chemical cycling wouldn't be possible and the whole ecosystem would shut down. dead plants and animals would be everywhere and new organisms couldn't be born/grown. mold breaks down dead organic matter like dead trees. as the result simple compounds come into existence and can be assimilated by plants

Decomposers break down waste and dead organisms,Decomposers recycle nutrients in the environment.

Explanation:

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.