C. plants don't need oxygen, they need carbon dioxide and PRODUCE oxygen. Animals DO. Need oxygen, I mean.
<span>D. take energy from the sun and make it usable for living things.
Producers are plants. Plants make energy from the sun through the process of photosynthesis and other living things (such as animals) eat the grass (known as grazing)
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<span>You wouldn't be able to defend against germs</span>