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How are the respiratory and circulatory systems connected? A. They communicate using neuroendocrine cells B. They connect across synapses C. They trade oxygen and carbon dioxide D. They send hormones to
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How are the respiratory and circulatory systems connected?

A. They communicate using neuroendocrine cells
B. They connect across synapses
C. They trade oxygen and carbon dioxide
D. They send hormones to each other

User Nathan Grigg
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1 Answer

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it k's A. or C........
User Vstrien
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