The Definition for the Theory of Evolution

I don't know what "biologically useful" means...

Genera as kinds''Among the apes, the gibbons, orangutans, chimpanzees and gorillas would each be included in a different basic kind.'' (Gish, 1978, p 35.)Families as kinds''Thus the genera Panthera, Felis and Acinonyx may represent descendants of three original created cat kinds, or maybe two: Panthera-Felis and Acinonyx, or even one cat kind.'' (http://www.creationontheweb.com/content/view/271/)Suborders as kindsthis website does what creationists very rarely do, and provides a list of "kinds". The general rule seems to be that a kind is the next taxonomic level up from family, i.e. a suborder or infraorder, although this is not completely systematic (mammal-like reptiles --- therapsids --- are lumped into one "kind", although they consistute an order). The same creationist excludes humans from the Catarrhini while lumping together oppossums, numbats, bandicoots, and the marsuipial tiger. (http://www.noahsarkzoofarm.co.uk/showmammals.php?kindNumb...)Orders as kinds''Some organisms seem to have more available diversity in their baramins than do others. Orchids and beetles each have thousands of named species''. (Creationism and Baraminology Research News: Stasis of the Baramin, Purpose, and Inheritance Mechanisms)Superorders as kinds''Among the reptiles the turtles, crocodiles, dinosaurs, pterosaurs (flying reptiles), and ichthyosaurs (aquatic reptiles) would be placed in different kinds.'' (Duane Gish: ''Evolution: The Fossils Say No!'')Phyla as kinds''There are over seven thousand species of segmented worms, the worm kind.'' (http://www.creationmoments.org/radio/transcript.php?t=850)

Hypothesis1 a : an assumption or concession made for the sake of argument b : an interpretation of a practical situation or condition taken as the ground for action
2 : a tentative assumption made in order to draw out and test its logical or empirical consequences
3 : the antecedent clause of a conditional statement

Almost every instance of vestigial parts I see I just have to laugh. The hindlegs of a whale? LOL Just because 'science' doesn't know what the purpose is doesn't automatically classify it under vestigial.

doubt whatever research has gone into this subject

Nievelstein, R. A., Hartwig, N. G., Vermeij-Keers, C., and Valk, J. (1993) "Embryonic development of the mammalian caudal neural tube." Teratology 48: 21-31.