Which groups of animals possess haemocoel?

Arthropods

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Mammals

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Echinoderm

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None of these

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Solution

The correct option is A Arthropods
Haemocoel is the body cavity of arthropods. It is filled with blood. The haemocoel is an enlarged blastocoel, which greatly reduces the coelom (this is restricted to the cavities of the gonads and excretory organs). The haemocoel can act as a hydrostatic skeleton.
Haemocoel is also seen in molluscs.

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