[inquest]

The difference between design and non-design lies in the intention of the designer. "Letting them evolve" is a design if the intention is, for example, to produce diverse living organisms through natural selection acting on variation and mutation.

If I see a dog who's about to lie down, and I say, "Lie down", he's not really obeying my command.

[edsheppa]

Well, obviously not only must there be intention but the designer must bring about or cause the intended result. I didn't think I'd need to spell it out, but I will know better in future when replying to you.