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a hormone produced by the adrenal glands which helps to maintain the balance of sodium in the...

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plant-like organisms that live and grow in water; they make their own organic food by the...

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the excessive growth of algae in eutrophic streams, rivers and dams.

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an expression consisting of one or more algebraic terms.

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a species that has been introduced into an area in which it did not previously or naturally...

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