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Which of the following represents the correct combination without exception?

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Body is covered by dry, cornified skin with scales; glandular skin; oviparity – Class Reptilia

Body devoid of scales and paired fins; cranium and vertebral column are cartilaginous – Class Cyclostomata

Three chambered heart; two pairs of limbs; body divisions are head, neck, trunk and tail – Class Amphibia

Terminal mouth; gills without operculum; skin with cycloid scales - Class Osteichthyes

answer is B.

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Detailed Solution

In members of Osteichthyes (bony fishes), gills are covered by operculum.
In amphibians, body divisions are head, trunk and tail. Neck is absent.
In reptiles, skin is dry without glands. Some members are viviparous.

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