The authors' misunderstanding of basic concepts is particularly obvious in their presentation of convergence. They treat the similarity of the bones musculature, nerves and development of hands in humans and moles as if it were no different than the gross similarity in the outlines of mole paws and mole cricket forelimbs. This sort of basic misunderstanding is what a biology textbook is supposed to clarify, not promulgate. The arguments presented in the discussion of convergence have no basis in the scientific literature, but trace back to the beginnings of modern creationism.