Exercise programs and sports activities can differ in number of participants from one person doing an activity like jogging or swimming, to hundreds of participants at a track meet. Structure can be loose in solo exercises where you can set your own pace, or be very strict in most competitive sports. Competition varies from none to highly competitive, and can be on an individual or team level. More complex sports and activities can present a high skill level.
B. because entry points are vital to the spread of infection
They are all in the same catagory but have completely different meanings
I believe the answer to your question will be D)
Answer:
I think if you're on here, you're in class or doing homework!
