Why are decomposers an important part of an ecosystem ? Plz explain cannot get this wrong !

Decomposers are vitally important to an ecosystem because without them, there would so many dead things littering the earth that we would all drown in a pool of perfectly preserved bodies! You can put that into your own words if you want, but that's basically why decomposers are a neccesity :)

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.