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

(1)

Viviparous

Mammalia

(2)

Possess a mouth with an upper and a lower jaw

Chordata

(3)   

3-chambered heart with one incompletely divided ventricle   

Reptilia

(4)

Cartilaginous – endoskeleton

Chondrichthyes

NEET