Job Outlook. Excellent. Respiratory therapists provide care and treatment for patients suffering from breathing and cardiopulmonary difficulties. They may also provide emergency medical care for patients who have experienced asphyxiation, heart attacks, or shock.
0 is a number alone or not. if you put 0 by itself its both a number and a digit.
1 The integer zero is neutral. It is neither positive nor negative. 2  The sign of an integer is either positive (+) or negative (-), except zero, which has no sign.  Two integers are opposites if they are each the same distance away from zero, but on opposite sides of the number line.