BGYA02 - Lec3 (text + lec combined notes)

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1 Feb 2012
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Chapter 21- the history of life on earth. For 14c, production in the upper atmosphere is about equal to its natural decay. The waste product is o2: one lineage of these oxygen-generating bacteria evolved into the cyanobacteria. Earth"s climate change: for earth to be in a cold, dry state, atmospheric co2 levels had to have been usually low, weather changes rapidly; climates usually change slowly. Cambrian period: cambrian period marks the beginning of the paleozoic era, by the early cambrian period (543 490 mya), atmospheric o2 levels had nearly reached current levels, the continental plates came together in several masses. & chengjiang (southern china: arthropods are the most diverse group in the chinese fauna. Paleozoic era: divided into the ordovician, silurian, devonian, carboniferous, and permian periods, each period is characterized by the diversification of specific groups of organisms, mass extinctions marked the ends of the ordovician, devonian, and permian.

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