B/c there's no natural competition for them to keep their numbers in check.
Usually they have no predators to keep their population under control.
Human, according to the theory of evolution.
Separate ecosystems can affect each other.
There are millions upon billions of different ecosystems and there are no names to them. I think you mean biomes. The different biomes are Tundra, Dessert, Forrest, Grassland, Marine, and Freshwater.
The nervous tissue.
events dear boy events, anything will change the equilibrium, becomes unbalanced when there is no reaction to an event which continues
This depends on which alpine ecosystem it is, the climate, and the predators within it. Different alpine ecosystems have quite varied animal populations.
Robert M. May has written: 'Stability and complexity in model ecosystems' -- subject(s): Animal populations, Ecology, Mathematical models, Stability
a non native species is a species that isn't within a certain ecosystem.
Tigers play a vital role in maintaining healthy ecosystems this is because it is a primary predator. Primary predators are important because they control other animal's populations.
animal life
Human, according to the theory of evolution.
Animal Atlas - 2004 Animal Populations 8-7 was released on: USA: 24 October 2011
A lot.
Trees
Larry M. Hunt has written: 'Energy flow in animal populations' -- subject(s): Animal populations
They effect animal populations because...... They do! if this ain't the answer you want, well then...... DEAL WITH IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Separate ecosystems can affect each other.