Animals devoid of respiratory,excretory,and c | vedclass

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(B) Members of the phylum $Porifera$ (sponges) are the most primitive multicellular animals. They lack specialized respiratory,excretory,and circulato

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Porifera

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(B) Members of the phylum $Porifera$ (sponges) are the most primitive multicellular animals. They lack specialized respiratory,excretory,and circulatory systems. Instead,they rely on a water transport system (canal system) for the exchange of gases,removal of waste products,and circulation of nutrients throughout their body.

Animals devoid of respiratory,excretory,and circulatory organs belong to the phylum:

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