pollution food loss,etc
Koalas are neither extinct nor in any immediate danger of extinction. At this stage, therefore, it is not an environmental problem.
Human activity and pollution will probably be the greatest cause of elephant extinction.
Driving them to extinction.
poaching.
What_may_cause_a_lion_extinction
the human been of course
Because of loss of habitat
ppls shooting them i guess?
pollution
The factors that generally cause mass extinction are changes in the natural ecosystem of the species. This may make it difficult for the species to reproduce and to stay alive.
There is no evidence that any aliens exist so it is impossible to say how they may cause extinction.
The extinction of animals is caused by humans killing animals. Extinction of animals may also be caused by pollution or forest fires that are killing off the plants and trees.