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Question

In which group of animals, the coelom is filled with blood?

A
Arthropoda
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B
Annelida
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C
Nematoda
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D
Echinodermata
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Solution

The correct option is B Arthropoda
The coelom of arthropods is obliterated by blood filled perivisceral sinuses, which constitute a hemocoel. During development, the blastocoel becomes the cavity into which blood is discharged, and the coelom is restricted to the cavities of the gonads and excretory organs.

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