Not bad, although I would put that the other way around — as those characteristics disappeared (due to luck o’ the draw, iow chromosome lines vanishing, and maybe mutation) other means of eating had to be innovated.
Isn't that like putting the cart in front of the horse?
(IMO) Environment changes usually drive genetic adaptation.
Can you point out a case where genetic variation caused an environmental change? Other than the obvious... mankind and global warming.