Humans were once the prey of many predators. In this insight, the human death rate is exclusively due to predators and proportional thereto. Predators death rate is exclusively due to famine and humans are their only food. The results is a robust population balance.

Just as we can use metapopulation models to study the probability of regional extinction, we can also study regional abundance and regional abundance trends.

4b. Change the Age 1 mortality rate to 0.3. Run the simulation starting with 75 individuals, all in Age class 1. What happens? Is this a stochastic model? If not, why does it look like it has a random component?

This is a tandem modified Lotke-Voltera model for a Human/Disease/Nature system. Biocapacity model (land model) replaces exponential growth. Humans with Technology eradicate Disease.