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Question

The Phylum considered to be evolutionarily dead end is

A
Cnidaria
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B
Platyhelminthes
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C
Nematoda
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D
Porifera
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Solution

The correct option is D Porifera
Phylum Porifera is sometimes considered an evolutionary dead end since no other animal groups are derived from them. They are so specialised in pumping water through their bodies that they are considered impossible to be modified into anything else.
Therefore, the correct answer is option D.

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