What is the site of gaseous exchange in an insect?

What is target site ?

In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood by

i) What is fertilisation ? Distinguish between external fertilisation and internal fertilisation. ii) What is the site of fertilisation in human beings ?

What is the principle of exchange of gases ?

Nucleus is the site of

Describe the mechanism of gaseous exchange in alveolous and pulmonary capillary.

An adaptation for better gaseous exchange in plant leaves is

Which one is not an insect