Q. Which is the first class among the tetrapods to shows completely 4-chambered heart?
A) Amphibia
B) Reptilian
C) Aves
D) Mammalia
Explanation
Aves is the first class to show completely four-chambered heart
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.