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B
Gnathostomata
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C
Lagomorpha
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D
Prototheria
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Solution
The correct option is A Agnatha A. Agnatha
Reason: The elongated marine and freshwater fishes lacking a jaw and paired appendages are generally found in Agnatha. The only living jawless fishes are the hagfishes and the lampreys. Agnatha is a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present and extinct species. So the correct option is A.