Final answer:
Ancient sea travel was possible, as evidenced by the discovery of 15,000-year-old rafts and canoes along the Pacific coast.
Step-by-step explanation:
Ancient sea travel was indeed possible. Evidence of 15,000-year-old rafts and canoes found along the Pacific coast suggests that ancient people were capable of navigating the seas. This discovery has significant implications for our understanding of early migration in the Americas, as it suggests that early humans may have utilized coastal routes for migration. The presence of these rafts and canoes challenges the notion that ancient sea travel was not possible.