During the development of a fetus, bones begin as cartilage, the same flexible material that makes up the ears.
The process of bone replacing cartilage is called ossification.

Question

Quizplus · Accepted Answer

During fetal development, bones indeed start as cartilage models, which are gradually replaced by bone in a process known as ossification, leading to the formation of the skeletal system.

During the Development of a Fetus, Bones Begin as Cartilage