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Question

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


  1. Arthropoda

  2. Annelida

  3. Nematoda

  4. Echinodermata


Solution

The correct option is A

Arthropoda


Arthropods have an open circulatory system i.e. their body cells are in direct contact (bathed) in 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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