Question

Bones of birds are light and hollow. Give reasons​

Answer 1

because if the bone wieght of bird increses it can't fly high

Answer 2

Answer:

Birds’ skeletons have a few unique adaptations to make flight possible. One of these is hollow bones.Hollow bones are also called pneumatized bones, meaning they’re filled with space for air. It is thought that this structure helps with oxygen intake during flight. Air sacs are attached to the hollow areas in a bird’s bones. Essentially, their lungs extend throughout their bones. This helps birds take in oxygen while both inhaling and exhaling.

Editted The answer is long but full information