Pocket Mice Population
Natural selection is when a certain trait in a species is better and the animals with that trait survive better than the ones without that trait. This is called survival of the fittest and it can cause a huge change in a population. For example, in the graph (upper left) it shows how the population of white coloured mice in location B (orange line) dropped dramatically when the environment changed while the population of the dark coloured mice in location B (green line) sky rocketed because they were more fit for the environment. The limiting factor for the white mice was that their predators could easily see them so more of them were caught and eaten.
I believe the populations in both places would be about the same in 100 years if the environment in both places didn't change. There would be more dark mice in location B and more white mice in location A; the white mice in location B and dark mice in location A would never completely die off because of the random mutations in both populations.
I believe the populations in both places would be about the same in 100 years if the environment in both places didn't change. There would be more dark mice in location B and more white mice in location A; the white mice in location B and dark mice in location A would never completely die off because of the random mutations in both populations.
Long Eared Jerboa Population
In the graph to the right it shows the population of Long Eared Jerboas over time, what happened to make the population drop was that people started expanding into the Jerboa's habitat and it got smaller and smaller. Another factor that's limiting the population are natural disasters; when there are earthquakes it can damage their tunnels and crush them and when there are floods it floods all their tunnels and drown them. A third would be their predators, if they had no predators their population would go up very quickly since there would be nothing hunting them down.