1. Ch16 Darwin’s Theory of Evolution 2. Lesson1:Darwin’s Voyage of Discovery 3. Darwin’s Epic Journey Evolution. 5. Change over time 5. Darwin developed a scientific theory of biological evolution that explains how modern organisms evolved over long periods of time through descent from common ancestors. 5. Born in England 2/12/1809 5. 5 year voyage on the HMS Beagle 3. Observations Aboard the Beagle Patterns of Biodiversity 5. (1) species vary globally, (2) species vary locally, (3) species vary over time 4. Species vary Globally Darwin noticed the different, yet ecologically similar, animal species inhabited separated, but ecologically similar, habitats around the globe. 5. Flightless birds: Australia (emu), South America (rhea), and Africa (ostrich) 5. Why? Kangaroos, rabbits 4. Species vary Locally 5. Darwin noticed that different, yet related animal species often occupied different habitats within a local area. 5. Examples includes the tortoises on the Galapagos Islands. They differed on each island as well as the mainland 4. Species Vary Over Time fossils 5. Preserved remains or traces of ancient organisms 5. Darwin notice that some fossils of extinct animals were similar to living species 5. Glyptodont (possible ancestor of the armadillo) 4. Putting the Pieces of the Puzzle Together 5. Evidence suggests that organisms are not fixed and that they may change due to a natural process 2. Lesson2: Ideas that Shaped Darwin’s Thinking 3. An Ancient, Changing Earth Principles of Geology 5. Hutton and Lyell concluded that Earth is extremely old and the processes that changed Earth in the past are the same processes that operate in the present 5. Hutton Published his work in 1830 4. Hutton and Geological Change Gradualism 5. Idea that processes that shaped the Earth took much longer than the original proposed time of a few thousand years…deep time 4. Lyell’s Principles of Geology Uniformitarianism 5. Added on to Hutton’s original idea, yet suggests that those same processes that had once shaped Earth are still occurring at the present time 5. Once Darwin witnessed one of the geological processes (an earthquake) he was able to agree with Hutton and Lyell’s insight of Earth’s true age. 5. Once accepting the idea that processes act on Earth over long periods of time, he would later be able to use the same application to describe the evolution of living things 3. Lamarck’s Evolutionary Hypothesis 6.