Which of the following is most likely to have a much higher breathing rate?
(a) man
(b) fish
(c) dog
(d) sparrow

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Solution

Answer: (b) fish
Explanation:
The breathing rate of aquatic animals is faster than that of terrestrial animals because the amount of dissolved oxygen in the water in much less than the amount on land, so they have to breathe more in order to get more oxygen.

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