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Question 1: [4][5][6] ________, plesiosaurs, pterosaurs and many species of plants and invertebrates also became extinct.
AigialosauridaeHelodermaMosasauroideaMosasaur

Question 2: Non-avian ________ fossils are only found below the K–T boundary and became extinct immediately before or during the event.
AllosaurusTyrannosaurusDinosaurTyrannosauridae

Question 3: In the seas, ________ suddenly appeared and underwent a spectacular evolutionary radiation.
AigialosauridaeHelodermaMosasauroideaMosasaur

Question 4: K is the traditional abbreviation for the ________ Period derived from the German name Kreidezeit, and T is the abbreviation for the Tertiary Period (a historical term for the period of time now covered by the Paleogene and Neogene periods).
CretaceousCretaceous–Tertiary extinction eventDinosaurGeologic time scale

Question 5: This was a period of great success for ________, with many new types appearing and diversifying.
AllosaurusTyrannosaurusBirdDinosaur

Question 6: The Cretaceous is named after the famous white chalk cliffs of southern ________, which date from Late Cretaceous time.
EnglandScotlandUnited KingdomWales

Question 7: [1] ________ were also present in both North America and Asia.
CeratopsiaPachycephalosauriaPachycephalosaurusHomalocephale

Question 8: The event marks the end of the ________ Era and the beginning of the Cenozoic Era.
DinosaurCretaceousMesozoicGeologic time scale

Question 9: Near the end of the Cretaceous Period, ________ diversified.
FernFlowering plantGymnospermEmbryophyte

Question 10: [3] A very small number of dinosaur fossils have been found above the K–T boundary, but they have been explained as reworked, that is, fossils that have been eroded from their original locations then preserved in later ________ layers.
Geologic time scaleGeologySedimentary rockSandstone
















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