Identify 3 density dependent factors that limit population size and explain how each exerts negative feed back?
How does a human populations; age structure affect its growth rate?
These are both on my AP biology summer assignment. They are listed under chapter 53: Population Ecology.
I really need some help.
Density-dependent factors are factors such as disease, parasites, or food supply that has an increasing effect as populations increase.
Density-independent factors are factors such as temperature, storms, floods, drought, or habitat disruption that affects all populations, regardless of their density. hope this helps :D
The factors affecting global human population are very simple. They are fertility, mortality, initial population, and time. The current growth rate of ~1.3% per year is smaller than the peak which occurred a few decades ago (~2.1% per year in 1965-1970), but since this rate acts on a much larger population base, the absolute number of new people per year (~90 million) is at an all time high. The stabilization of population will require a reduction in fertility globally. In the most optimistic view, this will take some time.