The K-T Boundary Event caused a sudden and extensive mass extinction. What do "K" and "T" in the K-T Boundary Event stand for?
a. Cretaceous and Tertiary
b. Cambrian and Triassic
c. Carboniferous and Triassic
d. Paleogene and Tertiary
Answer: a. Cretaceous and Tertiary
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Fill in the blank(s) with correct word