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10 cards from this deck
Long stasis periods + brief rapid evolutionary change bursts
Long periods where species remain relatively unchanged
Eldredge and Gould in 1972
Darwin's theory: species evolve slowly & steadily over time
Gaps in fossil record; absence of transitional fossils
Intermediate forms showing step-by-step changes between species
Rapid environmental changes creating intense selective pressure
Well-adapted to environment; less pressure for change
Evolutionary change happens too quickly in geological terms
Builds upon & refines Darwin's ideas, doesn't contradict
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