Living organis need energy for living. We need food and drink to get energy and materials. We eat rice, corn, vegetables, and bananas. Those come from plants. We also eat eggs , meat and butter, and drink milk. Those come from animals. Those animals may eat leaves of rice, cassava, or other plant. In other words, animals get their energy from the green plants. Green plant need such nutrition as in organic subtances, minerals, water, hormones, oxygen and karbon dioxide. The carbohydrates produced by the green plants will be used as the main energy resource for humans and animals. Human and animals cannot make their own organic materials, therefore, they are called heterotrophic organism. The heterotrophic organism depend on the autotrophic organism for their energy and nutrition.
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