Several factors are responsible for the rapid growth: a drop in mortality rates, a young population, improved standards of living, and attitudes and practices which favor high fertility.
Explanation:
lack of education on sexual topics which is of limited availability in underdeveloped countries cause teenagers or even young adults new to sex to just have it without noting how to protect themselves or the consequences of it. therefore causing a consistent rise. Standard of living comes into play when poverty allows for the kids to work to bring money home so it's seen as a way out to have children who work for you. the rest are self explanatory.
