When Darwin said that overproduction is needed for natural selection, he meant the following?
A there needs to be a large population of predators.
B there cannot be any predators.
C there must be a large population of offspring.
D there cannot be too many offspring

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.