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 Whole numbers less than zero are called negative integers. These numbers are to the left of zero on the number line. 2  The integer zero is neutral. It is neither positive nor negative.  The sign of an integer is either positive (+) or negative (-), except zero, which has no sign.