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Why are large boulders present in steep mountain streams?
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Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.
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What happens to the amount of waste in the pond as the ecosystem ages?
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Why are large boulders present in steep mountain streams?...
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