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3 May, 20:09

As a person exercises, carbon dioxide (CO2)

levels in the blood increase. This causes the

nervous system to signal which of these systems

to respond?

A digestive and immune

B immune and respiratory

C respiratory and circulatory

D circulatory and endocrine

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Answers (1)
  1. 3 May, 23:00
    0
    C bc it deals with both of those systems
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