Where does blood absorb oxygen in the human body?

What is the essential feature of respiratory organs in different terrestrial animals?

Which is the correct sequence of air passage during inhalation?

The surface across which breathing in animals occurs is very fine and delicate. How do organisms protect such surfaces within their body?

Name the type of respiration in which the end products are: $(a)$ $C_2H_5OH$ and $CO_2$. $(b)$ $CO_2$ and $H_2O$. $(c)$ Lactic acid. Give one example of each case where such a respiration can occur.

When a person breathes in air, the air enters into his body through an organ $A$ having two holes $B$ in it. The air then passes through pharynx and larynx and enters into a tube $C$. The tube $C$ divides into two smaller tubes $D$ at its lower end. The two smaller tubes are attached to two respiratory organs $E$. Each smaller tube divides inside the organs $E$ to form a large number of still smaller tubes called $F$. The smallest tubes $F$ have air-sacs $G$ at their ends in which gaseous exchange takes place in the body of the person. Identify $A, B, C, D, E, F$ and $G$.