Question

darwin’s finches evolved on an island. what is the main reason that islands often provide good examples of evolution?
○ they have many niches.
○ they have many organisms that live on them.
○ they allow for automatic biogeographic isolation.
○ they allow for many variations to exist in species.

Explanation:

Islands are geographically separated from mainland ecosystems, which creates automatic biogeographic isolation. This isolation prevents gene flow between island populations and mainland populations, allowing island species to evolve independently in response to local environmental pressures, making them clear examples of evolutionary change. Other options are not the primary reason: while islands may have niches or variations, the foundational factor driving distinct evolutionary examples is the isolation. A high number of organisms is not unique to islands or key to evolutionary examples.

Answer:

C. They allow for automatic biogeographic isolation.