Quote:
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Originally Posted by ravaila
A worldwide period of climatic cooling.................tukka 
What is the part of the tooth that you can see?
A: Dentin
B: Centium
C: Enamel
D: Crown |
tukka is wrong.....
its (D) A meteorite impact
A large meteorite is thought to have collided with the earth at the end of the Cretaceous period, some 65 million years ago. It probably struck near Mexico’s Yucatan peninsula. The extinctions were caused by climate changes resulting from the collision.