history of evolutionary thought. unit objective #1 i can communicate scientific information that...
TRANSCRIPT
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HISTORY OF EVOLUTIONARY
THOUGHT
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Unit Objective #1
I CAN COMMUNICATE SCIENTIFIC
INFORMATION THAT COMMON ANCESTRY
AND BIOLOGICAL EVOLUTION ARE SUPPORTED BY
MULTIPLE LINES OF EMPIRICAL EVIDENCE.
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LIFE CHANGES OVER TIME
Earth formed 4.6 byaLife began 3.5 byaMost life as we know it
has been here a relatively short amount of time on the geologic scale (~600 million years)
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What is a fossil: Preserved remains or traces of an organism from the past
How to make a fossil: Organism lives Organism dies Immediately, remains are buried to prevent rapid
decomposition Slowly remains (usually hard parts) are replaced w/ another
material
FOSSILS: OUR CLUES TO LIFE’S HISTORY
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Layers of the Earth show a consistently aging planetOrganisms living during the past have been preservedNearly all fossilized species are extinctTherefore: life evolves as the environment changes
BIG PICTURE
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Scientists have questioned how life came to be since BC
Scientists have formed theories for evolution for centuries
The widely accepted theory of evolution by natural selection explains…
BIG PICTURE
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PAST: ORGANISMS HAVE GONE EXTINCT
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PRESENT: DIVERSITY OF LIFE ON EARTH
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FUTURE: SPECIES CONTINUE TO EVOLVE