Question

Why energy flow through an ecosystem is one way

Answer 1

a goat can't eat us
a tree can't eat a horse
a rat can't eat a snake
so the energy flow is in one way

Answer 2

Energy is said to flow in a "1-way stream" through an ecosystem. In your own words, describe what that means.

Producers receive chemicals from light rays, 1st-level consumers eat producers, 2nd-level consumers eat 1st-level consumers, and 3rd-level consumers eat 2nd-level consumers.
I hope it helps if yes mark it as brain list