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Question

To inhale …………. and to exhale ……………. is called respiration.

A
None of these
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B
Nitrogen, Carbon-dioxide
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C
Oxygen, Carbon-dioxide
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D
Oxygen, Nitrogen
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Solution

The correct option is C Oxygen, Carbon-dioxide
The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.

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