... 1836. He found different things in the many areas that he visited. On the Galapagos Islands he discovered that many variations among plants and animals of the same general type as those in South America, where he found fossils of extinct animals that were similar to modern species. He saw that within species no two individuals were alike. Everywhere he went he ... Second, he believed that evolutionary change was gradual, which would have taken millions of years. Thirdly, he believed that the primary mechanism for evolution was a process called natural selection. That means that certain sp...

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• Approx Pages: 5
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• Grade Level: Undergraduate