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Which one of the following groups of animals is correctly matched with its one characteristic feature without even a single exception?

1. Reptilia : possess 3 - chambered heart with one incompletely divided ventricle
2. Chordata : possess a mouth provided with an upper and lower jaw
3. Chondrichthyes : possess cartilaginous endoskeleton
4. Mammalia : give birth to young one.

Correct answer: Chondrichthyes : possess cartilaginous endoskeleton

Solution

Chondrichthyes are cartilaginous fishes, so a cartilaginous endoskeleton is their defining feature without exception. The other choices each have exceptions: reptiles do not all share the same heart structure, chordates do not all have jaws, and mammals do not all give birth to young ones.

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