Rough and smooth ER is the two kinds
Answer:
A bottom-up system concentrates attention on how resources (space and nutrients) influence higher trophic forms , whereas a top-down system focuses on interactions at top level consumers (predators) and their prey influence on lower trophic forms.
Explanation:
hope it helps you !
Answer: It is important that we use our natural resources so that we use any bad things for our earth
Explanation:
