Food chains are relatively short because

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Which of the following statements best describes the organism designated R?

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The organism designated P in the food chain above is normally sustained by energy from

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Which of the following organisms is a primary consumer?

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Which of the following statements is true about sandy soil? It

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Which of the following instruments is used to estimate the number of plants in a habitat?

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What is the critical limiting factor for plants below the photic zone is an aquatic ecosystem?

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Which of the following statements about ecosystems is false?

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Which of the following organisms is an endoparasite?

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An organism whose source of carbon is inorganic is likely to be a/an

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Pepsin is secreted as an inactive precursor called pepsinogen because

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Which of the following treatments would increase the rate of transpiration in a potted plant?

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