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1. Group of animals descending from a common ancestry and possessing certain common characteristics which distinguish it from any other group.
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2. An extensive area of flat or rolling grassland, especially the plains of North-Central America.
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3. Animal that lives by preying on others.
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4. An animal or plant trained or adapted to live in a human environment and be of use to humans.
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5. A system of relationships between organisms and their environment.
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