Of as a result we know the earth and the solar system

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Unformatted text preview: e solar system are 4.6 billion years The old. old. The oldest fossil organisms on Earth (bacteria) are 3.5 The billion years old. billion There is plenty of time for evolution Transitional Species Transitional “..why, if species have descended from other ..why, species by insensibly fine gradations, do we not everywhere see innumerable transitional forms?” forms?” Charles Darwin, 1859 Charles Darwin’s Answer: Darwin’s There are imperfections in the fossil There record record List as many as you can List 1. 2. 3. Why do imperfections exist in the fossil record? fossil Most organisms don’t fossilize well Tissues differ in their likely hood to fossilize Environments differ in their likely hood to produce Environments fossils fossils Fossils are hard to find Fossils are destroyed by erosion & disturbances Many fossils are inaccessible Under ice, snow, sea & earth Fossils on surface aren’t ancient May be in politically sensitive areas To critics who demanded to see all of the intermediate steps before they would believe in evolution, Darwin said: “Opponents will say, show me them. I will answer yes, if you will show me...
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