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

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Presentation transcript:

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

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

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

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

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

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

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

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

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