2.3 keynote 2016
Transcript of 2.3 keynote 2016
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Change over Time
Chapter 2 Lesson 3
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What is natural selection?
population - all the members of the same species living in the same geographic area
variations - differences among members of the same species
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Charles Darwin - developed the theory of organisms changing over time
Natural Selection - Darwin’s theory that organisms pass on traits that help them survive in their environment. “Survival of the Fittest”
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extinct speciesno longer exists on earth
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Critical Thinking Questions
How do insects become resistant to chemicals that farmers use to kill them?
How does natural selection explain how organisms change over time?
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What is evidence of change over time?
Fossils - any remains, traces, or imprints of organisms that lived long ago
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— trapped in tree sap
—- wet footprints covered by sediments
How Fossils Form
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— tar pits
—bones of the animal harden into rock
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What fossils tell us - provide clues that tell us how environments change
Shark teeth fossils found in Tupelo, Mississippi mean that Mississippi was once under an ocean.
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- determine past climate of an area
Plant fossils found in Antartica mean it once was a warm environment.
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- what organisms were like in the past and how they have changed
Smilodon is the ancestor of the tiger. The teeth are smaller now. What does this mean?
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Critical Thinking Question
How do fossils provide clues that show how life and environments have changed?