Answer:
Primary osteoarthritis is mostly related to aging. With aging, the water content of the cartilage increases and the protein makeup of cartilage degenerates. Repetitive use of the joints over the years causes damage to the cartilage that leads to joint pain and swelling
Explanation:
Where are the choices...... High impact aerobic activities that are hard in your joints, examples, jogging, jumping, football, ect
Carbon monoxide is the answer.
