Evolution and the BIG LIE

Here's a question:Did the chipmunk adapt to its environment - or is it the other way around? Did hard shelled walnuts grow near because the walnut is easily cracked open by a chipmunk's sharp front teeth - or did it acquire such teeth because it saw lots of walnuts around?

In that co-evolutionary account, what is not addressed is that the walnut existed well before the chipmunk, being a form of vegetation - this points to the chipmunk settling here because it found walnuts and had corresponding sharp teeth.This appears similar to human pops settling near easy water and food [fish] supply, the latter event pre-dating the former: IOW, the water nor the fish acted to exploit the humans factor.Is there a different view, as both appear wanting?