Here's what Walt Brown said that Jukia questioned...Macro-evolution involves increases in complexity, like a leg evolving into a wing, or scales evolving into a feather, or a one-chamber heart evolving from a who-knows-what, or a two-chamber heart evolving from a one chamber heart. ... That's [an example of] macro-evolution, and its never been observed, and there have been all sorts of experiments trying to cause it to happen.
Jukia asked Walt Brown to provide "citations to the scientific literature to at least several of these experiments."
Jukia, haven't you heard of decades of breeding experiments based upon Darwinian notions, experiements which have failed, with fruitflies, bacteria, etc., and breeding efforts to cross the barriers of a species, barriers which the breeders continually banged into and couldn't cross.
Since Walt doesn't post here, let me provide citations for him:
See:
1) 20th-century science
2) Late 19th-century science
-Bob Enyart
