Answer:
Physical activity is any movement that is carried out by the muscles that require energy. ... Exercise is, by definition, planned, structured, repetitive and intentional movement.
Explanation:
The answer to 23 is, exercise helps by reducing the the chances of heart disease, improve daily living and sports because of less fatigue (tiredness), and decrease the changes of getting sick. Sorry I don't know the answers to any of the others
The femur is not part of the circulatory system because it is a bone.
