Immigration could cause the population to increase.
decrease the number of hawks
More predators so the population would decrease :(
go into war. that way the world population would decrease
The population of zoo plankton would decrease.
If the ozone depletes, UV will enter. This will cause an decrease in the penguin population.
An increase in the autotroph populations
it would decrease population
A population of an animal would decrease because of animal testing. 3/5 people agree.
Which would most likely decrease the genetic variation in the human population?
The grasshopper population.
The grasshopper population.