Evolution. Evolution. Change over time Process by which modern organisms have descended from ancient organisms. Charles Darwin. Born in England 1809 Set sail on H.M.S. Beagle in 1831 for voyage around the world
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Pinta IslandIntermediate shell
Sedimentary rocks form in horizontal layers.
When part of Earth’s crust is compressed, a bend in a rock forms, tilting the rock layers.
As the surface erodes due to water, wind, waves, or glaciers, the older rock surface is exposed.
New sediment is then deposited above the exposed older rock surface.
* Darwin’s discoveries went totally against the scientific ideas of the 1800’s
* He did not publish his research until he read Alfred Russel Wallace’s essay, which summarized Darwin’s thoughts on evolution.
* Published 25 years after his trip
* The struggle for existence
* Competition for resources
* Food, water, shelter, mates, etc.
Geographic Distribution of Living Species
* The limbs of birds, reptiles, and mammals may have different looks but they form from the same embryonic tissue – Divergent Evolution
* Similarities of Early Development
* Animals have similar embryological development
Typical primitive fish
2. In nature, tendency towards overpopulation
3. Not all organisms survive – compete for resources
4. Natural Selection – struggle for existence
5. Individuals best suited to their environment survive and reproduce most successfully
6. Species change over time
7. Populations today come from modifications of species of the past
8. All organisms are united into a single tree of life by common decent