How an ecosystem disrupt?

Invasive species aren't from the ecosystem so when they are introduced they may not have any natural species so thus they soon overpopulate an area for example the Asain Longhorn Beetle is an...

people have to do what they need to do when they do it for e.g..... playing on your IPAD makes the earths atmosphere turn 50 times in 1 sec

It can destroy the plant life , and wash away food sources for animals.

what do mean of human activities that disrupt the ecosystem