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Which of the following characteristic features always holds true for the corresponding group of animals?

1. Cartilaginous endoskeleton - Chondrichthyes
2. Viviparous - Mammalia
3. Possess a mouth with an upper and a lower jaw - Chordata
4. 3 - chambered heart with one incompletely divided ventricle - Reptilia

Correct answer: Cartilaginous endoskeleton - Chondrichthyes

Solution

Chondrichthyes are the cartilaginous fishes, so a cartilaginous endoskeleton is their characteristic feature. The other options are not always true for the entire group: mammals are not all viviparous, chordates do not all have jaws, and reptile heart structure varies.

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