TOEFL essay: Effects of overpopulation in developing countries

Overpopulation occurs when the food production is growing in arithmetic progression while the population growth is in geometric progression. Overpopulation is associated with many problems among which are: unemployment, increase in level of poverty, pollution, high rate of communicable diseases, high level of crime rate and poor housing. All these contributed to population explosion

TOEFL listening discussions: A conversation between a professor and her student