Answer:
1. Act of feeding on plant or animal food sources.
2. Digestion of food to break them into the simpler elements.
3. Use of these simpler elements to make new cells for growth and development.
Step-by-step explanation:
Animals feed on other animals or on plants for food and energy. The food enters their bodies and is broken down into simpler substances with the help of digestive system and enzymes.
The digested food is then absorbed by blood and reaches the cells of the body. These simpler elements then serve in growth by formation of new cells or increase in size of existing cells.