Q. Which of the following is an exclusive character of class-Mammalia?
A) Homoiothermy
B) Internal fertilization
C) Presence of a 4-chambered heart
D) Presence of a muscular diaphragm
Explanation
The correct answer is Option D: Presence of a muscular diaphragm.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.