Multiple choice

Which of the following organisms have single blood circulation?

  1. Fishes

  2. Mammals

  3. Birds

  4. Amphibians

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A Correct answer
Explanation

In fishes, blood passes through the heart only once during a complete circuit of the body, which is known as single circulation. The heart pumps deoxygenated blood to the gills, where it is oxygenated and then sent directly to the rest of the body. Mammals, birds, and amphibians have double circulation or variations of it.

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