What is the primary function of the respiratory system in humans?

Distinguish between aquatic and terrestrial respiration.

Yeast undergoes aerobic respiration whereas Amoeba undergoes anaerobic respiration. [True/ False]

Which part of the roots is involved in the exchange of respiratory gases?

$(a)$ Name the following:
$(i)$ Part where air is filtered by fine hair and mucus.
$(ii)$ Part which terminates in balloon-like structures.
$(iii)$ Balloon-like structures where exchange of gases takes place.
$(iv)$ Part which separates the chest cavity from the abdominal cavity.
$(b)$ Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?

How are inspiration and expiration brought about in human beings?