Answer: Health and Migration are 2 factors that can change a countries population. Health is one of the factors because if the health of the people are not great than people will die due to not having the proper healthcare. Migration is a factor because if you have people moving into your country that means the population will rise, if theirs people leaving the country the population would fall.
Because Africa is such a hot continent, lots of water gets dried up and evaporate. If we could have a better irrigation system and use rivers from around the continent, Africa could potentially start farming with the water they gain from the improved irrigation system.