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.