Why did Charles Darwin Believe That the Finches He Observed and Collected in the Galapagos Islands Shared a Common Ancestor?

English naturalist, Charles Darwin, believed the finches he collected and observed on the Galapagos Islands shared a common ancestor because he found they all greatly resembled a bird located on the Ecuadorian coast off South America. When Darwin initially began his journey on the Beagle, he was biased toward the widely accepted idea that every living thing on Earth was a divine creation, which remained unchanging and existing as it was originally created. However, when Darwin arrived on the Galapagos Island he began to see a flaw in this theory. …