Q. All mammals without any exception are characterized by
A) Viviparity and biconcave red blood cells
B) Extra-abdominal testes and a four chambered heart
C) Heterodont teeth and 12 pairs of cranial nerves
D) A muscular diaphragm and milk producing glands
Explanation
All mammals have heterodont teeth and 12 pairs of cranial nerves.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.