What will happen, if we did not have cartilage in our body?

Cartilage is a type of connective tissue made up of cells embedded in an extracellular matrix. 

It is firm, flexible tissue present in areas of the body such as ends of the ribs, ears, and nose, between the vertebrae in the spine, etc.

It holds bones together, reduces friction at joints, supports the respiratory tract, acts as shock absorbers between weight-bearing bones to prevent bones from rubbing against each other, and maintains the shape and flexibility of the body.

If we don't have cartilage, then it wouldn't be possible to come out from the birth canal of the mother, because without cartilage our body doesn't get enough flexibility to come out. We'll experience joint pain, stiffness, and inflammation (swelling). Some body parts, like the external parts of our ears, are made almost entirely of cartilage, it means without cartilage we'll born without the ear.