Because, without them, the dead animal will just sit there. So, having decomposers gets rid of the remains of the animal, and that way they can eat too. Hope it helps good luck!
Answer:
The amount of energy at each trophic level decreases as it moves through an ecosystem. As little as 10 percent of the energy at any trophic level is transferred to the next level; the rest is lost largely through metabolic processes as heat
From what I remember it's called a substrate
No there are no vacuoles in a human but there are in a plant but not humans.
