. A breath means


(a) inhalation of air rich in oxygen

(b) exhalation of air containing carbon-di-oxide

(c) one inhalation plus one exhalation

(d) one contraction and relaxation.

Best Answer

(c)

One inhalation plus one exhalation is a breath. A breath means taking in of air rich in oxygen into the body i.e. inhalation and giving out air rich in carbon-di-oxide i.e. exhalation.

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