The food that animals eat cannot be used directly by cells. What is the process of turning food into energy called?

Are you familiar with MRS. NERG? Many people use these letters as a reminder of the seven scientific terms - Movement, Reproduction, Sensitivity, Nutrition, Excretion, Respiration and Growth. Anything that is alive must demonstrate all seven of these processes. Believe it or not, everything that is alive has senses of some kind - even plants. They can tell in which direction the Sun is in, and they also know the difference between up and down.