Keratoacanthoma

Un/natural death and extinction

“…27 According to Anthony Hallam and Paul Wignall, a "mass extinction" is an event that eliminates a "significant proportion of the world's biota in a geologically insignificant amount of time," 28 and the previous five are as follows: the End-Ordovician Extinction, which came shortly after land plants developed; the Late Devonian Extinction, which came before the development of the earliest reptiles; the End-Permian and the Late Triassic Extinctions; and the End-Cretaceous Extinction, which was the most recent event that wiped out the dinosaurs, as well as three-quarters of all plant and animal life on earth. In this well-written, compelling book, Kolbert offers multiple helpful explanations, both about the concept of extinction in general, and also about the way in which the extinction event we are experiencing now differs from those five that preceded it.…”