During respiration,exchange of gases takes place in:

What are the common features of the respiratory organs in aquatic and terrestrial animals?

When we breathe out,why does the air passage not collapse?

During the respiration of an organism $A$,one molecule of glucose produces two $ATP$ molecules,whereas in the respiration of another organism $B$,one molecule of glucose produces $38$ $ATP$ molecules.
$(a)$ Which organism is undergoing aerobic respiration?
$(b)$ Which organism is undergoing anaerobic respiration?
$(c)$ Which type of organism,$A$ or $B$,can convert glucose into alcohol?
$(d)$ Name one organism which behaves like $A$.
$(e)$ Name two organisms which behave like $B$.

Lack of oxygen in muscles often leads to cramps among cricketers. This results due to

$(a)$ How does the exchange of respiratory gases,oxygen and carbon dioxide,take place between tissues and blood in human beings?
$(b)$ Name the respiratory pigment in humans. Where is it found?