Earth
Who takes care of all the plant life?
What the hell do we care?
Sure a change in plant life could cause a change in the types of surviving species, but that's not related to this thread.
If it has no afformentioned plan or design, it was an accident.
An accident is something that was not meant to happen, but did.
You just claimed we were an accident, and are thus not part of God's original plan. Congratulations.
any change by breeding or anything else does not produce new creatures.
Actually it does.
As a species has genetic hiccups and various mutations, it begins to change. It may not be able to reproduce with the species from which it was born. Due to certain environmental factors, more of that sub-species may arise. If these live long enough, the sub-species may be able to reproduce with other members of that sub-species, if they are capable. Eventually a new population may be established (in 1 year, 10 years, or 10,000 years) in which that sub-species can have its own sustainable niche.
Now, that sub-species may go through a few changes. Physical changes, keen to its environment. The skin may get tougher, the paws may get larger, the leg bones may get shorter. Anything. With enough changes, and eventually to the chromosomeslikely from a benevolent mutationthe sub-species can no longer mate with the original from which is came.
The original one may also have changed, over the years. Making it even more different. It may have receeded into the water, leaving the once sub-species (which is now its' own genus) to have the land for themselves, and thus take advantage of it and grow to its maximum potential.
Like Native Americans. When North America was discovered by Leif Ericson or that Irish Preist so many seem to think discovered it, the natives were almost 5'10''. That's because they grew to their near-maximum potential. The French and other European cultures were too busy dealing with famine, disease, malnutrition, and other very poor societal factors.
With their high-protein diets and abundance of buffalo, caribou, moose, deer, elk, and other animals of the wilderness, their bodies changed and benefited from it.
Some scientists think the Inuits eyes are slanted to help combat the high-speed chilling winds, which they lived in for an estimated 10,000 years. That's a prime example of evolution. Unfortunately, the changes were minor and I am not able to give some great big mind-blowing example.