get people to leave a area
evolutionary forces is most likely to decrease variation between populations
Global Warming
Populations increase and decrease because people leave one country (emigration) and enter another (immigration). A rise or fall in either the birth rate or death rate in a country can also cause populations to increase or decrease.
After carrying capacity, populations decrease.
A decrease in the availiable water
people die or leave to a different place
plankton populations decreasing
Food availability is a determining factor.
The hawk population increases and the other populations decrease.
Food availability is a determining factor.
Plankton population decrease plankton making less oxygen
Fragmentation can lead to a decrease in genetic diversity within populations and increase isolation between populations which can then decrease overall species diversity in an area. This can result in reduced resilience to environmental changes and increase the risk of local extinctions.