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a large oxygen-carrying protein (blood pigment).

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ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...

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

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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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