Name the openings in the respiratory system of insects.

Give an example of small organism in which the ratio of surface area to volume is high.

The branchioles end in millions of tiny interconnected cavities called:

Carbon dioxide and oxygen diffuse in and out of leaves through small openings called:

In large organisms, such as humans, the ratio of surface area to volume is:

The water proof layer that protects human skin.

Insects have a protective layer that covers their skin called:

Large amount of water vapour are lost from leaves by which of the following process?

Name the process by which the exchange of gases between an organism and its environment takes place.

Write the name of the process of stomatal opening and closure.