| Values
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| An estimation of the worth of things; a set of ethical beliefs and preferences that determine our sense of right and wrong.
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| Variation
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| Genetically based differences in behavior, structure, or function in a population.
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| Vector
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| An agent like an insect or tick that carries a parasite from one host to another.
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| Vertical city
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| See thchnopolis.
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| Vertical stratification
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| The vertical distribution of specific subcommunities within a community.
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| Vigor
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| Applied to crop plants or animals, refers to traits for hardiness to disease, drought, cold, and other adverse factors or conditions.
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| Village
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| A collection of rural households linked by culture, custom, and association with a community.
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| Visible light
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| A portion of the electromagnetic spectrum that includes the wavelengths used for photosynthesis.
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| Vitamins
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| Organic molecules essential for life that we cannot make for ourselves; we must get them from our diet; they act as enzyme cofactors.
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| Volatile organic compounds
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| Organic chemicals that evaporate readily and exist as gases in the air.
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| Vulnerable species
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| Naturally rare organisms or species whose numbers have been so reduced by human activities that they are susceptible to actions that could push them into threatened or endangered status.
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