Which one is not a deuterostome?

Chordata

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Cephalochordata

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Annelida

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Echinodermata

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Solution

The correct option is C Annelida
The deuterostome is the first opening (the blastopore) which becomes the anus. Chordata, Cephalochordata and Echinodermata are deuterostomes, while annelids are protostome in which the first opening in the embryo becomes the mouth.
So, the correct answer is ' Annelida'

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