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9 March, 11:43

What are the two gases that animals exchange with their surroundings?

A. oxygen and nitrogen

B. nitrogen and helium

C. hydrogen and carbon dioxide

D. carbon dioxide and oxygen

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Answers (2)
  1. 9 March, 11:48
    0
    A. oxygen and nitrogen
  2. 9 March, 11:58
    0
    D

    we breathe in oxygen
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