It has taken biologists some 230 years to identify and describe three quarters of a million insects; if there are indeed at least thirty million, as Erwin (Terry Erwin, The Smithsonian Institution) estimates, then, working as they have in the past, insect taxonomists have ten thousand years of employment ahead of them. 99

From "Endless Forms Most Beautiful," from The Sixth Extinction: Patterns of Life and the Future of Humankind, by Richard Leakey and Roger Lewin. Copyright © 1995 by Sherma B. V. Reprinted by permission of Doubleday, a division of Bantam Doubleday Dell Publishing Group, Inc.

References to Scientific American project ideas are located throughout this unit.

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This sea star clearly demonstrates pentamerous radial symmetry.

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