people die or leave to a different place
A low birth rate and environmental hazards are two things that can cause a population to decrease.
A low Birth Rate and environmental hazards are two things that can cause a population to decrease.
people die or leave to a different place
Death - especially war & disease.
The biggest thing that can change a population is the availability of jobs in that are. 2 other things that can change the population of an area is what businesses are there and the crime rate.
By Genocide, and by war..
The deathrate exceeds the birthrate.
Increase "Baby Boom"
When 2 things increase or decrease by the same proportion
A decrease in the birth rate will cause a decrease in population over time.
The population of zoo plankton would decrease.
Death and migration are factors that can decrease hare population.