Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system why?

Enlist the various parts of respiratory system.

Name the parts of respiratory system of cockroach.

Why does gas exchange in the alveolar region very rapid?

Why do lanslides occur at those places only ?

Is it correct to say that photosynthesis occurs only in leaves of a plant? Besides leaves, what are the other parts that may out be capable of carrying photosynthesis? Justify.

What keeps the various organs and organ systems separate from each other? Why?

Why is only carbon used and not any other element for defining atomic mass unit?

Why does the growth of a plant occur only at specific parts of the plant body?

Why is plant food not produced in any other parts of the plant except the green ones?