state reason for the following 1.nematodes have pseudocoelom 2.arthropods have open circulatory system
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nematodes do not have completely developed mesodermal linning cavities called coelom. they have cavities that are not formed completely by mesoderm. thus they are not true coelom and are known as pseudocoelom.
blood does not flow in well defined blood vessel of the arthropods so they have open circulatory system
blood does not flow in well defined blood vessel of the arthropods so they have open circulatory system
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