Final answer:
Biogeography provides evidence for evolution by showing how closely related species are often found in the same or nearby geographic areas.
Step-by-step explanation:
Biogeography is the study of the distribution of living organisms across different geographic regions. It provides evidence for evolution by showing how closely related species are often found in the same or nearby geographic areas. In the case mentioned, Darwin observed that iguanas from South America differed from those from the Galapagos Islands. The variation in characteristics between these two populations of iguanas is an example of how isolation and adaptation can lead to the formation of new species over time.
Learn more about Biogeography and evolution