I was discussing creationism with some people who came to my door early one morning.
When they found I believed in Darwin's theory, one said if I had found a watch (clock) on the moon would I think it had evolved?
I said that if the moon was populated by a horde of terminally late entities it would be possible as they could have created the conditions to force a watch to evolve.
As Darwin theorises, nature forces evolution. It is not random, the change must be benificial to the organism. It is not static as the Pepper moth of the UK proves.
And in some places it is not taught because it is against Christian values.