In general, anxiety disorders

a.
only occur in families with a history of these disorders
b.
have symptoms that can be treated with therapy and medication
c.
involve less anxiety than most normal people experience
d.
are not affected by a healthy diet and regular exercise

Which is one way that sinkholes can form? a) tornadoes touch down and destroy trees and brush b) rivera overflow during a storm and wash away nearby land c) rainwater flows away from a depression in the ground d) groundwater dissolves the limestone and other rocks in the ground