Almost the entire system of an embryo is made of cartilage, whereas that of an adult is mostly made of bones.
A head injury happens due to trauma to the brain or skull and classified as close or sometimes penetrating. It may occur right away or develop slowly. An example is contusion which is the answer on this scenario. This is called mild traumatic injury caused by a blow on the head yet none of the tissue of the brain is torn.
The answer is C. Fertilization. hope I helped.
C would be the answer, that way the cold temperatures won’t penetrate through
