When, in the geologic column, did dinosaurs become extinct:
Submitted by: Administrator1. at the Cretaceous-Tertiary boundary
2. at the Jurassic-Cretaceous boundary
3. at the Triassic-Jurassic boundary
4. at the Permian-Triassic boundary
Answer: 1
Submitted by: Administrator
2. at the Jurassic-Cretaceous boundary
3. at the Triassic-Jurassic boundary
4. at the Permian-Triassic boundary
Answer: 1
Submitted by: Administrator
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