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25 August, 00:32

By pumping water over their gills, fish and aquatic mollusks?

a. keep their gill membranes moist

b. maintain their body temperature

c. keep themselves moving through the water

d. promote diffusion of oxygen and carbon dioxide

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Answers (1)
  1. 25 August, 00:56
    0
    I think it is answer D. (Fish are able to use the oxygen from the H2O molecule to breathe)
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