What does your question mean?
Answer:
the answer is all of the above
Your question is really vague, but when I typed it in, I found this website with people answering the same question: https://studyandanswers.com/biology/question20660094
They help in reducing many diseases that can spread through dead and decaying matter and also foul smell
I'm pretty sure it's a community.
Hope this helps :)
