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Fossil Records & Radio Metric Dating By, Karley, Alexis, Olivia, & Scott By, Karley, Alexis, Olivia, & Scott.

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Presentation on theme: "Fossil Records & Radio Metric Dating By, Karley, Alexis, Olivia, & Scott By, Karley, Alexis, Olivia, & Scott."— Presentation transcript:

1 Fossil Records & Radio Metric Dating By, Karley, Alexis, Olivia, & Scott By, Karley, Alexis, Olivia, & Scott

2 What is Evolution? Change over long period of time Two major mechanisms that drive evolution Natural selection process causing heritable traits Genetic drift, process that produces change

3 Macro Evolution New species are produced from earlier species Occurs at species level or above. Changes span long periods of time Can occasionally occur over shorter time

4 Fossilization with Macro Evolution Appeared almost similar after first appearance Led to hypothesis of punctuated equilibrium Could this hypothesis cause mass extinctions? Still unclear what causes evolutionary tempos

5 Microevolution Change involving gradual accumulation of mutations Minor evolutionary changes in short time

6 House Sparrows? Arrived in 1800s North=Larger and Darker color South=Smaller and Lighter color

7 Radiometric Dating Breakdown known materials radiometric decay 1905 Rutherford and Boltwood mineral age Mass spectrometer discovered over 200 isotopes Radioactive isotope has its own half-life

8 Evolution Conclusion Concept how world came to be Slow change over time within species Evolution contains micro and macro changes Natural selection helps decide who survives

9 Bibliography e/_0/evo_02 e/_0/evo_02 aq/cat01.html aq/cat01.html


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