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Questions for Discussion: When Did the First Americans Arrive?
- Why is sea level lowered during an ice age?
- Scientists sometimes need to revise a theory in the light of new evidence. Explain how the discovery of 12,000-year-old tools in South America caused scientists to rethink their explanation of human migration to the Americas.
- How does fossil evidence indicating that bears survived the last ice age contribute to ideas about human migration in North America?
- Do you think it is possible that if bears could have survived the Ice Age, humans could too? Explain your answer.
