Knees and elbows are the types of joints that are present to move the parts of the body attached to it. The knees are the elbows, and the elbows are the knees.
The joints knees and elbows work like the door and allow the movement of the attached body parts in back and forth directions.
The elbow of the arm region and the knee of the leg region have similar functions and are homologous in the function that moves the leg of the lower region and the arm of the upper region.
Therefore, option c. both is the correct option.
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