Ecologists make models to gain insight into complex phenomena such as the effects of global warming on ecosystems.
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D. Tap water out of a steel bottle
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substantive genes
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Colloids or colloidal solutions are mixtures in which microscopically dispersed insoluble particles of one substance are suspended in another substance. The size of the suspended particles in a colloid can range from 1 to 1000 nanometers (10-9 meters).
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Appalachian Mountains are a part of the Lithosphere