BIOLOGY 1M03 Chapter Notes - Chapter 9: Oligocene, Tooth Enamel, Continental Drift
23 Feb 2017
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Evolution produces adaptation, but what is adaptive in one environment is not adaptive in another. Only because the climate became colder, humans evolved; if it would stay warm, human ancestors would remain in the safety of the trees. Continental drift is important for 2 reasons: oceans served as a barrier, continental drift engined climate change. O16 isotope evaporates more, so snow and rain have a higher concentration of it. If the climate is warm, the water that evaporates, it returns back to the sea as precipitation. If it"s cold - o18 isotope ration increases, because o16 is now stored in glaciers. In a living organism, the ratio of c12 and c14 is the same as in the atmosphere. In a dead organism, there must be more n14, because c14 starts to decay. Argon evaporates from the rock, so the only argon present in the rock is due to the decay of.
