1. A Change Through Time

2. What is Evolution? It’s a gradual change in a species over time.

4. Background History: Charles Darwin: Explorer on a observation trip aboard the HMS Beagle in the Galapagos Islands. He found a variety of species similar to those found in South and Central America and some completely new.

5. Darwin came up with the theory of Natural Selection Natural Selection : means that organisms with traits best suited to their environment are more likely to survive and reproduce. “ Survival of the Fittest”

8. 2. Variations are found among individuals of a species.

9. 3. Variations are passed on to offspring.

10. 4. Some variations allow members of a population to survive and reproduce better than others.

11. Over time, offspring of individuals with helpful variations make up more and more of a population.

12. Variations: an inherited trait (change in the DNA) that makes an individual different from other members of the same species. Could be color, shape, behavior or chemical makeup

13. Unit: Evolution Topic: Methods in which species evolve

17. Evidence of Evolution

18. 1. Fossil Record Oldest fossils are at the bottom Newest at the top

19. 2. Homologous Structures - body parts that have the same number of bones, muscles or blood vessels.

21. 3. Vestigial Structures - a body part that doesn’t seem to have a function at this time. Example Pelvic bone in whales

22. 4. Embryology- studying organisms at the very early stages of development to see how they are the same. Show overhead