_________ are complex, interactive systems that include both biological communities and physical components of the environment.

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________ are dependent on their environmental interactions both with living and nonliving factors

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Different populations interact to form ___________,

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Communities live within an ________, with all of these on Earth making up the biosphere.

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Like individual organisms, ecosystems are sustained by continuous ______ ___ ______.

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__________ describes the variety of species.

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___________ - _________ limiting factors include competition for food, water, shelter, and space, predation, parasitism, and disease. These are triggered by population density increase.

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A _______ is a group of organisms belonging to the same species that live in a particular area. They can be describe based on their size, density, or distribution.

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Explain what is happening in this graph.

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The total amount of energy available at each level decreases, explain why?

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