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the study of the origin of words, and of their history and changes in their meaning (in other...

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organisms whose cells have a true nucleus and true organelles. These structures are not...

a figure of speech in which a harsh fact is expressed in a gentle way, e.g. He passed away.

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animals that live socially or in colonies and perform certain tasks for the good of the colony...

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the excessive growth of alga and hydrophytes in response to the addition of artificial or...

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