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Which of the following set of characters are present in all mammals without exception?

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Viviparity and biconcave red blood cells

Heterodont teeth and 12 pairs of cranial nerves

Extra-abdominal testes and a four-chambered heart

A muscular diaphragm and milk-producing glands

answer is D.

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Detailed Solution

All mammals are characterised by a muscular diaphragm and milk producing glands, without any exception.

Testes are abdominal in prototherians (e.g., platypus), and some eutherians such as elephants, rihinoceros, whales, dolphins and sea cows.

Platypus is oviparous.

A few mammals such as porpoises and armadillos have homodont teeth.

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