The component of exercises that's the most often overlooked is?
a)variability
(b) duration
( c) frequency
(d)intensity

Felicia has a respiratory infection and has been coughing up a lot of mucus. she knows this means that her respiratory system is working to restore balance by getting rid of the invasive materials from her lungs. how does this happen?

Epidemiology and health expenditure

Which of the following is not of the top health concerns in the united states