Why are elbow and knees called hinge joint?
what are some disorders that can occur in joint

Movements of joints and orientation of bones forming the elbow and knee joint results in a hinge type joint used for extension and flexion of arm and legs.

Explanation:

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.

looks like the answer is     c     to me!