B. The air you breathe.
Because the rest of the choices are not environmental factors. Gang activity, and access to jobs and education are not environmental because environment are things about the world.
1) oxygen. 2) bone size 3) inner core, outer core 4) 10
Answer: C. Melatonin.
Explanation: Melatonin is the hormone responsible for sleep and wake cycles. :)
They usually have the supplies to administer a shot, a blood pressure machine, the little tool light the use for checking the eyes, ears, nose, mouth. They also have gowns and tongue depressors for checking for strep throat.
I imagine it would be nursing and residential care facilities
