(a)(i) Over-population is a situation where a country has more people than its physical and human resources can support with adequate living standard
(ii) Migration is the movement of people on a seasonal, or permanent basis from their original location to another.
(b)(i) Three factors responsible for over-population include:
(a) Low level of education
(b) The culture of the people/large family size)
(c) High birth rate
(ii) Three factors responsible for migration include;
(a) Environmental hazards e.g earthquake, floods, drought
(b) Low standard of living -search for greener pastures
(c) Fear of insecurity e.g War, Political instability etc.