BIOL 2400 Chapter Notes -Cyanobacteria, Prokaryote, Eukaryote
5 Apr 2013
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Document Summary
Darwin claimed that from geological formations resulted the gradual change that spread over vasts amount of time on earth. Lord kelvin had proposed that to determine the age of the earth/world was not through lookin at rock formations but at their temperatures. (determining how long have they been cooling down for) Physicists finally concluded that the way to calculate the age of the earth was thru radioactive decays. The earth is 4. 568 billion years old. Lagerstatte (plural lagerstatten): a site with an abundant supply of unusually well-preserved fossils from the same period of time, often including soft tissues. Burgess shale: a lagerstatten in canada that preserved fossile from the cambrian period. Fossils show everything about an organism, from what it eats to what creatures eat it to where it was and how it died. In-living birds, some of the color of their plumages are produced by pigment-loaded structures called melanosomes.
