Where do animals get their energy?

1. from the Sun

2. by eliminating waste from their systems

3. by reducing their oxygen intake

4. from the food they eat

It's answer 4 which is from the food they eat.

Explanation:

This happens as the following:

When animals eat their food, the food is digested. Then the food stored is processed by the cell mitochondria. Mitochondria converts energy into food. The food then is eliminated as waste from their bodies.

Animals get their energy from the food they eat.