Q. Long bones that are hollow with air cavities (pneumatic) are characteristic of:
A) Reptilia
B) Aves
C) Mammalia
D) Amphibia
Explanation
Birds have a fully ossified endoskeleton with pneumatic long bones, a crop and gizzard in the digestive tract and a completely four-chambered heart.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.