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

Arthropoda

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Annelida

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Nematoda

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Echinodermata

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Solution

The correct option is A Arthropoda
Arthropods have an open circulatory system, i.e., their body cells are in direct contact with blood. Therefore, their body cavity or coelom which contains all internal organs is filled with blood. This is in contrast to a closed circulatory system in which blood only flows through blood vessels.

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

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