These solutions may offer step-by-step problem-solving explanations or good writing examples that include modern styles of formatting and construction of bibliographies out of text citations and references. Students may use these solutions for personal skill-building and practice. Unethical use is strictly forbidden.The leading paradigm up until two to three decades ago was that humans could not have possibly migrated along the Pacific coast after crossing the ice-free corridor that led from northeastern Asia to northwestern North America. However, recent archaeology studies demonstrate that the northern Northwest Coast was not actually blocked with glacial ice after 14,000 B.C. as previously thought while at the same time the ice-free corridor was actually blocked instead from 21,000 to 11,000 B.C....
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