Which of the following are jawless animals?

Gnathostomata

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Agnatha

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Both A and B

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None of the above

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Solution

The correct option is D Agnatha
Agnatha is a superclass of jawless fishes in the phylum Chordata. These are ectothermic, meaning they do not regulate their own body temperature. They show slow metabolism in cold water. They do not have a proper stomach rather they have a long homogenous gut.
So, the correct answer is option B.

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