How much physical activity should an adult have each week?
a. 60 minutes per day, 7 days a week
b. 30 minutes per day, 7 days a week
c. 60 minutes per day, 5 days a week
d. 30 minutes per day, 5 days a week
select the best answer from the choices provided.

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

What economic effects might result from the depletion of groundwater supplies from the ogallala aquifer? need to know asap

In which way does nicotine cause addiction? by stimulating the brain’s pleasure center by increasing blood-sugar levels by decreasing dopamine levels by reducing depression and anxiety