How does tree trunk exchange gases with the environment although it lacks stomata?

How does rate of development affect the environment ? Explain

How do exchanges of gases take place in the lungs.

How does adsorption of gases on solids depend upon: Temperature?

How do plants and animnals help each other in the exchange of gases in the atmosphere ?

How does adsorption of gases on solids depend upon : Nature of gas ?

What is meant by stoma?Name the group of plants,which contains fewer stomata on the upper surface of leaves .How does the absorption and loss of poassium ions in the guard cells bring about the opening and closuure of stmata?Explain.