The function of the respiratory system is to exchange two gases: oxygen and carbon dioxide.
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Answer:
C
Explanation:
the first 2 choices aren't even systems at all, and D is specifically talking about the water and not mentioning animals/plants at all.
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Answer: HORMONES
Hope this is correct :-)
It should be the first one(glycolysis)
because a glucose molecule is to large to pass through a cell membrane cells assist glucose diffusion through facilitated diffusion and two types of active transport.
