What does the term "K-T boundary" refer to?   a The transition from a period in Earth history called the Cretaceous Period to a later one called the Tertiary Period.   b The boundary between a time when dinosaurs didn't exist (below the boundary) to a time when they did exist (above the boundary)   c A layer that marks the first appearance of living organisms in Earth history.   d The transition from a period in Earth history called the Permian Period to a later one called the Triassic Period.

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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What does the term "K-T boundary" refer to?

 
a The transition from a period in Earth history called the Cretaceous Period to a later one called the Tertiary Period.
 
b The boundary between a time when dinosaurs didn't exist (below the boundary) to a time when they did exist (above the boundary)
 
c A layer that marks the first appearance of living organisms in Earth history.
 
d The transition from a period in Earth history called the Permian Period to a later one called the Triassic Period.
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