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the teeth found at the back of the mammalian jaw. In herbivores they have broad surfaces and...

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a substance that consists of two or more chemically joined atoms.

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a kingdom of very small, single-celled organisms without a nucleus. They reproduce asexually by...

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a crop consisting of one plant species which is cultivated over a large area.

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a relatively small, similar building block of larger molecules (polymers).

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