Which of the following is the best description of natural selection?
the struggle to exist.
the change in variation of a species.
survival of the fittest.
overproduction of offspring

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.