Evolution: Evidence and Theory

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Presentation transcript:

Evolution: Evidence and Theory Chapter 15

Whale Evolution

Process of Natural Selection

Comparing Vertebrate Embryo Development

Forelimbs of Vertebrates

What Do Fossils Tell Us Organisms existed previous to current time Some organisms are no longer present Life has changed as time has gone by Environment has changed over time

Fossilization Incomplete record Soft v.s. hard organisms Habitat Access

Evolution of the Horse

Interpreting the fossil record It is not a perfect science!

Evidence of Change Over Time One type of fossil formation Becoming a Fossil

Evidence of Change Over Time When was earth estimated to have formed? Radioactive Dating Carbon 14 half life Young Old Radioisotope dating

Rate of Decay of Potassium-40

By knowing Carbon 14’s half life you, can estimate the age of fossils. Aging fossils

Continental Drift Theory

Darwin’s Voyage

Traits that are favorable for some organisms in some environments are not necessarily favorable for all organisms or all environments