Which of the following is absent in animals o | vedclass

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(D) Animals belonging to the phylum $Porifera$ (sponges) are the most primitive multicellular organisms. They exhibit a cellular level of organization

Vedclass · Accepted Answer

Nerve cells

Vedclass · Answer

(D) Animals belonging to the phylum $Porifera$ (sponges) are the most primitive multicellular organisms. They exhibit a cellular level of organization. They possess a unique water transport system (canal system) and specialized cells called $Choanocytes$ (collar cells) that line the $Spongocoel$ and canals. They often have a skeleton made of spicules or $Spongin$ fibers. However,they lack a nervous system,meaning they do not possess $Nerve$ $cells$ or sensory organs. Therefore,the correct answer is $D$.

Which of the following is absent in animals of the phylum Porifera?

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