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Organism
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Any living thing
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Animal
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A member of the Kingdom: Animalia; includes humans, insects, earthworms, etc.; does not include single-celled organisms
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Mammal
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A vertebrate animal with a four-chambered heart, hair, and mammary glands
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Species
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A group of organisms that are capable of successfully interbreeding
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Population
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A group of members of a species that live together
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Community
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A group of interacting species
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Environment
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All of the factors, biotic and abiotic, that affect an organism at any point in its life cylce
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Ecology
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The scientific study of the factors that determine the distribution and abundance of organisms
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Ecosystem
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A biotic community together with its abiotic environment
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Habitat
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The physical surroundings in which a species lives
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Niche
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The role of a species in its environment
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Autecology
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Study of the relationships in one species
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Synecology
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Study of one ecosystem and the communities in them
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Aristotle
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1st ecologist
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Threophrastus
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Student of Aristotle
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