Ecosystems have to have two factors working together in order to function. what are those two factors?
a. trees and biotic factors
b. temperature and abiotic factors
c. biotic factors and living factors
d. biotic factors and abiotic factors

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

Crossing over is a method of (blank)?