Question 7
Animal KingdomA characteristic of vertebrates that is unique to mammals is
- A.the presence of pentadactyl limbs
- B.parental care
- C.the possession of scrotum
- D.pulmonary circulation.
Show the answer and explanation
Answer: C (the possession of scrotum)
Explanation
Pentadactyl limbs, parental care and pulmonary circulation are found in other vertebrates too, but a scrotum holding the testes outside the body is found only in mammals.