. 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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