In which group of animals, body cavity is filled with blood?

Nematoda

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Arthropoda

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Amphibians

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one of the above

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Solution

The correct option is B Arthropoda
In Arthropods, the body cavity is filled with blood. This is called as haemocoel.
Haemocoel :The body cavity present in the arthropods and molluscs, which 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.

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