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19-10-2018
Chemistry

contestada

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

Respuesta :

bobby774 bobby774

19-10-2018

d
we breathe in oxygen

Answer Link

19-10-2018

A. oxygen and nitrogen

Answer Link

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