Answer:
B. Liquid water flowed on its surface
Answer:
Community, also called biological community, in biology, an interacting group of various species in a common location. For example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes a biological community.
Explanation:
Answer:
B. The atmosphere is a component and the Earth itself is the boundary.
Explanation:
Tertiary, because you knock off 90% every level you go up.
