Then you'd have a very crowed planet.
Or else you'd have a very primitive one - with little or no evolutionary advance.
We wouldn't be here, that's for sure. Only the extinction of the dinosaurs allowed mammals to grow to larger than mouse size.
Why did the dinosaurs go extinct? Humans will never go extinct!
It has NEVER been extinct.
Hopefully never.
if they go extinct then the things that they eat will get over populated.
When they go extinct or are about to go extinct, they are called endangered. This usually happens when there is a widespread famine, drought, etc.
No , the daleks will never die!!
Eventually wildlife will go extinct and we will have no source of food and therefore WE will go extinct. So in the long run, without wildlife: WE DEAD!
never ever do that because so many things can go wrong and so many things can happens to where its just not worth it!
Never. They will always be around, like cockroaches and rats.
A mule.
All animals go extinct because hunters shoot..... animals kill..... and many things die of old or sickness... or murder.
Hard to say. They may never go extinct. But I've heard some people say they will go extinct in 20 years (lowest estimate I've heard). <><><> In some cases, polar bear population is increasing, in some, decreasing. UN staff indicate that they COULD become extinct in a century, but the changes in population growth could mean they wil not become extinct.