Answer each question in slide show, it'll be a powerpoint slideshow. Also you just need to make 8 power point slide show.

Describe the theories that exist that try to explain why there were major changes to the population size, health and life expectancy of humankind. A display of a timeline showing the estimated human population numbers on planet earth since humans were first found on planet earth to the present is required. Also, any additional maps, charts and displays showing populations of humankind throughout different phases in history will be helpful to your presentation. You must also present data showing the estimated "life expactancy" of humans since (at least) the start of the death of Christ period up until the present is required. Your goal is to provide the picture of how the human population has changed over time and how human life expectancy has changed over time.