Question

when the supply of energy and nutrients influences ecosystem activities at higher trophic levels by affecting the amount of energy that moves up the food chain, the ecosystem is said to be controlled from the _________.
predator selection
prey selection
bottom - up
top down
competition factor

Explanation:

In an ecosystem, when the supply of energy and nutrients at lower trophic levels (the base of the food - chain) influences activities at higher trophic levels by determining the amount of energy transferred up the food - chain, this is known as bottom - up control. It starts from the primary producers and moves up.

Answer:

C. Bottom - Up