Agymnastics student lands awkwardly and hurts her ankle. after mri scan, it was revealed that she has a torn cartilage. the health care worker states it may take up to 3 to 4 months for this injury to heal. the basic physiologic reason behind the prolonged recovery is due to the fact that cartilage is/has primarily:

Cartilage is avascular, which is the basic physiological reason behind the prolonged recovery of the injury.  

Cartilage is avascular tissue, which is a contrasting feature of bone tissue. Both the cartilage and bone comprises cells, which discharge an extracellular matrix that produces the composition of the tissue. Cartilage is more flexible in comparison to the bone, however, it also possesses substantial tensile strength.  

The repairing of cartilage is mainly a gradual procedure and may in fact not take place in some of the situations. In comparison to cartilage, the extracellular matrix of bone is mineralized, forming a hard tissue that possesses the tendency of giving support for the body and safeguarding for its essential compositions.  

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers