Atavisms and Fossil Order. Ring species. Ring Species - Salamanders. Horse Evolution. Horse Evolution Over 55 Million Years Excerpted from the Florida Museum of Natural History Fossil Horse Cybermuseum.
See detailed discussion of horse evolution at: How can you explain the sequence of horse fossils? Diatoms. The Walking Whale. Is Evolution Predictable? If one could rewind the history of life, would the same species appear with the same sets of traits?
Many biologists have argued that evolution depends on too many chance events to be repeatable. But a new study investigating evolution in three groups of microscopic worms, including the strain that survived the 2003 Columbia space shuttle crash, indicates otherwise. When raised in a lab under crowded conditions, all three underwent the same shift in their development by losing basically the same gene. The work suggests that, to some degree, evolution is predictable. More than 50 years ago, researchers studying basic cell biology began raising a tiny soil worm, the nematode Caenorhabditis elegans.