I believe the reason for this would be geographical evolution. Different ecosystems cause the finches to evolve differently over time. Also, since the finches on the Galápagos Islands are closer to the one in South America, it is likely that finches from there (South America) could have moved to the islands, contributing to the evolutionary process.
Choose B: a book written by a historian who is an expert on medieval Europe.
I trust that book because the book was written by an EXPERT. Someone who is trustworthy and knows more about a student-produced website.
They were laws in the early history of the American south which legalized the segregation between blacks and whites.