Age of the Earth - 4.6 billions years, Earth began to solidify - 4 billion years ago, Earth cool enough for liquid water - 3.8 billion years ago, Bird, bat, insect WINGS (same function, different structure) - analogous structures, Characteristic no longer needed to survive (appendix, tailbones in humans) - vestigial structure, Same structure, different function - homologous structures, Major example of how the environment impacted evolution millions of years ago - continental drift, Level of taxa for bacteria - domain, Level of taxa for eubacteria - kingdom, Endosymbiotic theory describes development of - eukaryotic cells, adapt to the __________ or go extinct - environment, advantageous trait passed along to future generations - adaptation,

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