When we eat plants, we get more of the sun’s
energy than when we eat animals. That’s why it is good
to eat fruits and vegetables.When an animal eats a plant,
the energy is less strong. The animal also used its energy
to find the plant to eat. When a second animal eats the
first animal, it gets even less energy than the first animal
got. The second animal used a lot of energy to
chase its prey.
Like a car that has to be filled with gasoline, living
things have to eat again and again. Instead of gasoline,
living things use food as fuel.