DAVID: The roots produce a substance which keeps away pests:-http://phys.org/news/2016-01-dandelion-latex-roots-insect.html-David's comment: My usual question. How did evolution find the proper enzyme molecule to do the job? Hunt and peck? Enzymes are huge and complex molecules often with metal ions attached.-And my usual question: Are you now suggesting that 3.8 billion years ago, God equipped the first living cells to pass on a programme for making dandelions with the proper enzyme molecule? (Plus programmes for a few billion other innovations, lifestyles and wonders?) Or did he personally intervene to make sure dandelions survived?