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Question

In which of the following brain is absent?

A
Cyclostomata
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B
Pisces
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C
Amphibia
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D
Protochordata
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Solution

The correct option is D Protochordata
Protochordates are closely related to vertebrates. These lack some of the peculiar characteristics of chordates like the true skull, brain, skeleton. These are invertebrates.
So, the correct answer is option D.

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