(a) Draw a diagram of the human respiratory system and label the following:
(i) The part where the air is filtered by fine hair and mucus.
(ii) The part that terminates in balloon-like structures.
(iii) Balloon-like structures where the exchange of gases takes place.
(iv) The part that separates the chest cavity from the abdominal cavity.
(b) Why is the rate of breathing in aquatic organisms muds faster than in terrestrial organisms?

(a) i) The part where the air is filtered by fine hair and mucus is NOSTRILS.

ii) The part that terminates into balloon-like structures is LUNGS.

iii) Balloon-like structures where the exchange of gases takes place is the ALVEOLI.

iv) The part that separates the chest cavity from the abdominal cavity is the DIAPHRAGM.

(b) The rate of breathing of aquatic organisms is faster than terrestrial organism:

• The amount of oxygen dissolved in the water is much less as compared to the amount of oxygen in the air.

• The animal on the land can use the oxygen present in the air but the aquatic organism need the oxygen present in the water

• The amount of oxygen dissolved in the water is low.

• Hence the rate of breathing of aquatic organisms is much faster than the terrestrial organisms.