Why do organisms need water?
Organisms need water for
(i) Cellular processes - as all the processes take place in a water medium.
(ii) Transportation of substances - water is used for the transportation of substances from one part of the body to the other.
(iii) Reactions - All the reactions that occur in the cell or body occur between substances dissolved in water.
Do you know of any activity which may be polluting this water source?
How are clouds formed?
What is soil erosion?
List any three human activities that you think would lead to air pollution.
