Question

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Answer 1

The gills of a fish contain a network of fine blood vessels (capillaries) that take up the oxygen molecules in water and diffuse it through the membranes. So I would say, "They take in oxygen gas dissolved in the water through their gills" would be the most correct.

Answer 2

That is what I put hoping that that was the right answer thanks

Answer 3

Hopefully it's right! They try to trick you with that last option.