2nd+Period+Unit+5+Evolution+Zach+and+Taylor

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media type="custom" key="15471392" []& Vocabulary 1. Graduation- a slow change over a long period of time 2. Puntuated Equilibrium- a quick change in species 3. Fossil- evidence of a once living organism 4. Sedimentary Rock- formed in layers 5. Limestone- the most common form of a sedimentary rock 6. Homologous Structures- structures in organisms that look similar but have different functions 7. Vestigial Structures- structures in organisms that they do not need 8. Radiometric Dating- the theory that comparing the decay rate of a radioactive element to the decay rate of the element found around the fossil can give an exact age 9. Fossil Record- shows that simple organisms came before more complex organisms; sometimes difficult to read because it has gaps 10. Variation- a difference in a species 11. Adaption- a variation that enables an organism to carry out life functions 12. Natural Selection- adaptions being used to decide in nature what organisms will survive longest 13. Survival of the Fittest- the theory that organisms that are best adapted to their environment are more likely to survive and reproduce offspring that will inherit those traits that helped the parents survive

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