BIOC61H3 Lecture 10: Lecture 10

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The important recognition that some 99% of all the species that have existed on the planet over history have vanished. The number of species today estimated to be alive is 32 to 100 and some put it about 100 million and nobody argues that there is more than that. Wilson is in the biodiversity field and has done work on insect biodiversity in particular but he exaggerates a little. Never before in history have there been that many species alive and this is not surprising. The ongoing forces to diversify would have to bring about larger and larger diversity of species. When life first took root on the planet went from ediacaran from multi-cellular life divergence followed by a bigger explosion in the cambrian (darwin wrote about this). Bacteria organisms have been around much longer from achaean period which is under debate (roughly 3. 5 billion years old). There are other fossils now from s. africa,

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