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| birth_place = [[Sterling, Illinois]]<ref name=nb1 /> ...achelor's degree from [[Manchester College (Indiana)]] in 1931 and a Ph.D. from the [[Ohio State University]] in 1934.<ref name=nb1 /> His first position ...

Differences may make it easier to find food, hide from danger, or give birth to offspring which survive. The offspring will have s ...from those of long ago. The older the fossils, the bigger the differences from modern forms.<ref name="Levin">Levin, Harold L. 2005. ''The Earth through t ...