Pleass Help With Ecosystems Question For Biology!!!!!?

Question

How does an ecosystem change when climate changes or when a new species is introduced due to migration, evolution, or human intervention of bringing in a species not native to the area that then adapts and reproduces in the wild?

Answer 1

http://www.defenders.org/wildlife/global...

http://www.urbanext.uiuc.edu/ecosystems/...

Answer 2

look at pleistocene extinction, and human impact. have a look and island ecosystem too. good luck. enjoy, i did...