a clean environment is best suited for viviparous animals
The answer of that qeustion is natural selection of which animals produce offspring.
Every animal is always evolving, but we can not see it because it take many years. Only in a state of Hardy-Weinberg equilibrium, is when evolution does not occur. Animals are always are trying to be the most fit for their environment. Also the animal has no say in Natural Selection, the environment will chose the best animal for it's environment. Animals that are maladapted, or not suited for their immediate environment will die. Also an animal can be the best suited for it's environment, but if it can not reproduce there is no way those genes can be passed on to the next generation.
A tundra
A large corporate environment
A large corporate environment
the ones which have mutations which would help them to survive
For some animals or plants this can mean they don't get enough food and die early, sometimes before they can reproduce and pass on their genes.
raising catteling
Wolverins and they are the most dangerous in alberta
they made their homes best suited for their environment by uses thier common sense and also they used their surrounding like if you had alot of trees but a little of snow........................you would would use the thing that you have most of to adapt to your environment
To the environment.
Adaptation allows the organism to become best suited for its environment!