Which is NOT a way that variation is added to a population?

i dont know this but ask your teacher for !

i'd say that the moon rock is about 2.2 billion years old.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.