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Variables are parameters that are monitored and controlled or affected by the feedback system
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A) Divergent evolution because all of the species have similar structures during the first stage of development.
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C)Poaching and habitat loss
Answer:External respiration occurs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air. Internal respiration occurs in the metabolizing tissues, where oxygen diffuses out of the blood and carbon dioxide diffuses out of the cells.
Explanation:
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