Paleoanthropologist Leakey and coauthor Lewin (Origins Reconsidered, LJ 9/1/92) examine biology's traditional viewpoints, which maintain a linear progression from simple to complex species development. In this scenario, survival of the fittest means success, and species extinction indicates failure. The authors also present the current trends in evolutionary science theory suggesting that the world is shaped by mass extinctions (natural catastrophes have caused five) instead of natural selection and that the shape and behavior of biological communities is driven by chaotic interaction rather than the simplistic balance-of-nature concept. Leakey and Lewin argue that Homo sapiens is the result of many chance events in evolution rather than the foreordained culmination of evolutionary excellence. Unfortunately, our self-awareness and mental capacity has given us the dubious capability of triggering a sixth extinction, destroying entire species through overhunting and habitat destruction. As the only sentient creature among animals, we have the duty to protect all of Earth's species. The authors present a powerful message based on years of observation and fieldwork. Highly recommended for all collections.?Gloria Maxwell, Kansas Cty. P.L., Kan.
Copyright 1995 Reed Business Information, Inc.
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