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Unformatted text preview: n and the rate of ex4nc4on A B C D A) B) C) D) Two‐minute thought ques4on • Think about the evolu4onary history of life on earth: over 3.2 billion years, the number of species has risen from 1 to 10 million • Every specia4on event results in a gain of one species and every ex4nc4on event results in a loss of one species • What can you infer about the rela4ve rates of specia4on and ex4nc4on over earth’s history? • Species diversity at any point in 4me is driven by the rate of specia4on and the rate of ex4nc4on Origina4on of new Life Forms Origina4on of new Life Forms Origina4on of new Life Forms •...
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- Spring '12