Question

why are cartilaginous bone are flexible​

Answer 1

Bones protect against the mechanical damage and supports the movement of the body, provide shape to the body. And as cartilage being soft they are usually found along the respiratory tract, between the joints and in other flexible parts of the body. Our body's skeletal system is made up of bones and cartilage.

Answer 2

it provides support it is rigid than the muscles but have flexibility to provide complete motion at the joints they are soft