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Closed circulatory system occurs in

1. cockroach
2. tadpole/fish
3. mosquito
4. housefly

Correct answer: tadpole/fish

Solution

A closed circulatory system keeps blood confined to arteries, veins, and capillaries. Tadpoles and fish are vertebrates, so they have a closed circulatory system, unlike insects such as cockroach, mosquito, and housefly which have open circulation.

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