Question

A(n) _____________ is defined as the interrelationship between living beings and environment.

Answer 1

I believe that you are right D should be the correct answer I'm pretty sure that's the stsudy of both

Answer 2

The correct answer is A. An ecosystem is the relation between living and nonliving organisms living together to make it work. An atmospheric system, like the word says, is one of the Earths many layers composed of mainly oxygen and nitrogen. Its location is 10 miles from Earths surface and is 300 miles thick.