First of all, this whole alien evolution thing looks a bit fishy. In less than a hundred years alien organisms are able to do what it took Earth’s creatures millions of years to do? And, speaking as a geologist, the right conditions just weren’t there. No undersea volcanoes or plate tectonics, no glacier activity or limestone deposits on the sea floor. Even if a few organisms had indeed adapted to the new "Earth-like" conditions, it was statistically impossible that those creatures should simply repeat step-by-step the same changes and shifts that had taken place millions of years ago on Earth. Whatever was going on, somebody had an interest in keeping P-L5 uninhabited, and it was up to you to beat them.
Leads and Sources
Magazines and Articles:
"When Life Exploded," J. Madeleine Nash. Cover Story Time Magazine December 4, 1995.
"On Embryos and Ancestors," Stephen Jay Gould. Natural History 7/98-8/98, p. 20.
"The Evolution of Life on the Earth," Stephen Jay Gould. Scientific American October 1994, p. 85.
"Breathing Room for Early Animals" (Oxygen), Andrew H. Knoll. Nature Vol. 382, July 11, 1996, p. 111.
"The Big Bang of Animal Evolution," Jeffrey Levinton. Scientific American November 1992.
"Hypersea," Dianna and Mark McMenamin. Discover October 1995, p. 76.
"The Emergence of Animals," Mark McMenamin. Scientific American April 1987, p. 94.
"Life’s Grand Explosions." (theories on why the Cambrian explosion occurred), Lori Oliwenstein. Discover January 1996, p. 42.
"The Molecular Explosion," Henry Gee. Nature Vol. 373, February 16,1995, p. 558.
Internet Sites:
The Divisions of Precambrian Time
http://www.ucmp.berkeley.edu/precambrian/precambrian.htmlLife of the Vendian
http://www.ucmp.berkeley.edu/vendian/vendianlife.htmlLearning About the Vendian Animals
http://www.ucmp.berkeley.edu/vendian/critters.htmlOxygen Pulse and the Evolutionary Expansion of the Metazoans
http://www.geocities.com/CapeCanaveral/Hangar/8200/Oxygenation.htmlCambrian Explosion
http://www.carleton.ca/Museum/camex/1ahome.html
Books:
The Emergence of Animals: The Cambrian Breakthrough. Mark and Dianna McMenamin, 1990, Columbia University Press.
Biology: The Science of Life. Wallace, Sanders and Ferl, 4th ed., 1996, Addison-Wesley.