Sort:  

Think about this... mutations that bring about adaptation and evolution are seemingly random and uncontrollable.

The "natural selection" of subsequent adaptations is determined by the environment.

Manipulate the environment and then you are able to manipulate what is "naturally selected".

Control the environment sufficiently for long enough and you are able to control what evolves.

Artificial selection through selective breeding demonstrates exactly this principle and that is how Darwin figured out natural selection.

If artificial selection had been going on for millions of years we would have more than just fancy breeds of cats, dogs and other domestic animals.

Read over this response a few times to fully absorb it. Makes sense.