In order to survive, animals need air, water, food, and shelter (protection from predators and the environment); plants need air, water, nutrients, and light. Every organism has its own way of making sure its basic needs are met.
Plants and other autotrophs make food out of “thin air”—at least, they use carbon dioxide from the air to make food. Most food is made in the process of photosynthesis. This process provides more than 99% of the energy used by living things<span> on Earth. Photosynthesis also supplies</span>Earth's atmosphere<span> with </span>oxygen<span>.
hope it help ;P
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I think what keeps blance is the hips or brain