I think it is called crust which is outermost layer of planet or satellite.
Poop. I don't really know what you are asking but the excretory system removes the stuff from our stomach that we cant use or stuff that already has all of the nutrients that we need removed. Hope this helps
A person who specializes in the study of animals is called a zoologist. Zoologists who study certain kinds of animals have their own names.
you didn't list choice but i'm guessing chloroplasts
