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Which one of the following has an open circulatory system?

1. Periplaneta
2. Hirudinaria
3. Octopus
4. Pheretima

Correct answer: Periplaneta

Solution

Periplaneta (cockroach) is an insect, and insects have an open circulatory system where hemolymph flows through body cavities. Hirudinaria and Pheretima are annelids with closed circulation, while Octopus is a cephalopod with a closed system.

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