Which early Cambrian fossil from the Chengjiang biota is considered an early ancestor of vertebrates?
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What is the name of the Burgess Shale fossil considered the earliest known chordate?
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Pikaia
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What is the term for the evolution of similar traits in unrelated species due to similar environmental pressures?
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Convergent evolution
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What is the name of the extinct group of large, flightless predatory birds that lived in South America during the Cenozoic?
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terror birds
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What is the term for the evolutionary process where beneficial traits become more common over generations?
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natural selection