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An organism that makes it own food through photosynthesis. It gets its energy from the sun.
An organism that lives in the soil and breaks down decayed matter like dead plants and animals. Examples include bacteria and earthworms.
A group of organisms of the same kind that live in the same area. Populations can increase or decrease in number.
carbon dioxide - oxygen cycle
The pattern of plants using carbon-dioxide to make oxygen and animals breathing in oxygen to make carbon-dioxide
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