Answer:
it nitro(N) accounts for 70% of the earth's atmosphere
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Answer:
Pathway of air: nasal cavities (or oral cavity) > pharynx > trachea > primary bronchi (right & left) > secondary bronchi > tertiary bronchi > bronchioles > alveoli (site of gas exchange)
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In radiation, we don't need medium to conduct heat or energy but in conduction we need medium to conduct energy or heat ! conduction is done by contact as in radiation there is no contact !
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<span>This is continuous aerobic activity. While regular aerobic activity can incorporate rest periods, this style of activity does not. Activities such as walking, slow jogging, stair climbing, and swimming can all fit this definition, because they can be done without rest for long periods.</span>
Betelgeuse is colder but more luminous