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Question

Which of the following is the smallest taxonomic group of animals having a cranium, vertebral column, ventral heart, pulmonary respiration and two pairs of limbs?

A
Gnathostomata
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B
Tetrapoda
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C
Vertebrata
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D
Chordata
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Solution

The correct option is A Tetrapoda
Gnathostomata includes fishes which don't have four limbs. Vertebrata includes Agnatha which doesn't have well-developed cranium or limbs. Protochordates or primitive chordates do not have a well-developed cranium, limbs, vertebral column or ventral heart. Of the given options only tetrapods have all the listed characters.

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