bio 9.9.16 - Darwin’s Hypothesis Individuals vary...

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Darwin’s Hypothesis Individuals vary Populations tend to over-breed Struggle for existence Survival of the fittest Variations are inherited New species develop Deduction (prediction) 6: If the hypothesis of evolution is correct, then fossils should show evidence of change through time. Test: Study fossils at various depths in rock strata Paleontology=study of ancient life (fossils) Data: Types of fossils (original material); ex. Mammoth in ice Skeletal material Bog People Mosquito in amber Permineralization=petrification=mineralization of organic matter (ex. Petrified forests buried in volcanic ash) Carbonized film=a silhouette of blackened carbon residue of an organism Mold=impressions of an organism in rock Cast=a mold filled-in with mud or stone leaving a replica of the organism Chemical fossil=molecules produced by an organism left behind in rock Trace fossil=evidence that an organism has left behind that it was present in the past (ex. Footprints, feces, worm tubes, tracks) Evaluation: Many fossils of organism exist that are no longer present on Earth (ex. Dinosaurs,
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