Add labels to the figure that follows, which illustrates the predicted pattern of changes in human population growth rates when death rates fall.

Question

Graph showing changes in human population growth rates as death rates decline over time.

Accepted Answer

Hi everyone. Let's look at the next problem. It says determine the density independent factor that alters the per capita growth rate regardless of population density. So we're thinking about the growth rate of a particular population and seeing which factors will affect that growth rate regardless of how dense the population is. And of course population density we recall would be the number of individuals per unit of area, so people per square mile plants per square foot. So uh factors that are independent of this population density and affecting per capita growth rate. So let's look through our answer choices. Choice A. Is competition. Competition will be dependent upon density. The more dense the population, the more competition there will be for resources, there's more individuals in a given area, competing for the resources in that area. So competition will definitely have a greater effect in more dense populations. Choice B says predation predation is also dependent on density. A greater number of predators in the area will result in higher death rate for the prey animals. And that will definitely change their growth rate. Greater number of prey animals. We also start to affect the um as they kill off the prey that will start to affect the predator population because their food force will be gone more quickly. So, Choice B predation is not our answer as it is also dependent on density. Choice C. Is wildfires and wildfires would be a density independent factor. When you have a wildfire in an area, you're going to affect the growth rate of organisms living in that area, regardless of how densely they were spread in that area. Before finally, choice, the infectious disease, infectious disease will be um, definitely is density dependent. The more dense the population, the more the disease will spread, spreading to more individuals and therefore affecting that population growth rate. So our answer to a density independent factor that alters the per capita growth rate would be choice. C wildfires. See you in the next video.

Add labels to the figure that follows, which illustrates the predicted pattern of changes in human population growth rates when death rates fall.

Verified Solution