I'm not quite sure what you are looking for as an answer, but they give the human body structure, shape, support.
It is made up of the bones of the skeleton, muscles, cartilage, tendons, ligaments, joints, and other connective tissue that supports and binds tissues and organs together. The musculoskeletal system's primary functions include supporting the body, allowing motion, and protecting vital organs.
A as it is most stressful and a very lonely time hope this helps
Explanation:
Decrease level of calcium in the blood is the correct answer
The answer would be Sociology Education since it relates to both advertising and human behaviors.