Open circulatory system is seen in: — Zoology | Mockzy

MediumZoologyBody fluid and circulation

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Open circulatory system is seen in:

Arthropods and annelids

Arthropods and molluscs

Molluscs and annelids

Annelids and chordates

For circulation, simple organisms such as sponges and coelenterates use:

Number of heart chambers present in fish, amphibians, reptiles, birds and mammal

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