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Many types of large reptiles died out, along with non avian dinosaurs, during the K-T mass extinction. These include pterosaurs, plesiosars, mosasaurs, and marine crocodylomorphs. Ammonites, a highly successful group of molluscs, became extinct. On land, scientists believe that no species larger than a housecat survived.

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How are extinct organisms related to other extinct organisms as well as living organisms?

By the way they look, (their bone structure, body weight) and DNA too.


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What is the name of the process in which groups of organisms die out?

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