Cacti Biogeography: A Prickly (Pear) Problem for Young Life Creationism

Young-earth creationists (YECs) routinely appeal to post-flood hyper-evolution to explain the diversification of pairs of ancestral animals into dozens and even hundreds of descendant species in the space a few hundred years following a global flood 4500 years before present.  For example, a pair of ancestral canines are said to have evolved in less than 1000 […]