I think it is C change in climate revealing passageways for migration. Because early humans started in africa and went from there to everywhere
<span>What was keeping the American government from sending troops to Europe sooner and what exactly was the United States doing before the Japanese launched their attack on Oahu? Let’s explore the American mindset and history from 1939 to December 8th, 1941, when war was declared on Japan.</span>
1. 305,326
2. It was built to create a navigable water route from the Atlantic Ocean to the Great Lakes Basin
C. Unfamiliar with the topic. Biographical essays inform people about someone’s life. You need research, and it takes time. Experts on the topic would already know about this. People who are unfamiliar with the topic would be able to read your essay and know more about said person.