Because mood disorders such as depression substantially increase the risk of suicide, is a matter of serious concern for clinicians.
a. suicidal behavior
b. poor study habits
c. peer pressure
d. earning bad grades

The Answer is A. it's pretty much common sense yeah a depressed person or suicidal person can be put into peer pressure and earn bad grades and have poor study habits, that can be normal. but Suicidal behavior is a serious concern

Because mood disorders such as depression substantially increases the rick of suicide and suicidal behavior is a matter of serious concern for civilians. A 

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.