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Sci-Ed Fact:

IMPORTANT EVENTS IN EVOLUTION

TIME (mill. of yrs.)-EVENTS
4600...............Earth forms
3600...............Oldest fossils
2000...............Oxygen in atmosphere
650.................Multicellular life in oceans
590.................Fossil record begins
440.................Life moves to land
400.....,,..........Vertebrate fish abound
250.................Dinosaurs appear
65...................Dinosaurs become extinct
4.....................First hominids
0.1..................First Homo sapiens
0.005..............Recorded history

(JamesTrefil)

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