Why is there such a huge variation in athletic ability from person to person?

When you improve the ability of your muscles to repeatedly exert themselves you're improving your

Which of the following is a health risk associated with ground-level ozone? a.cataractsb.skin cancerc.respiratory illnessd.all of the above

In the category column, classify the following activities as either health promotion or health protection. if any of these actions fall under both the categories, write both. in the reason column, write down your reason for making each classification.