(a) Explain the following terms:
- (i) Population
(ii) Competition;
(iii) Succession. [9 marks]
(b) (i) State three sources of noise pollution.
(ii) List two ways by which noise pollution can be reduced. [5 marks]
(c) State three effects each of the following pollutants on humans:
(i) smoke;
(ii) sewage. [6 marks]