The birds shown below live on a single island.

Question

These four bird species are closely related, and all of them share a common ancestor with a single species. What environmental factor is most likely to have caused this diversity of species?

o When the ancestral species arrived at the island, there was only one food source, so the ancestral species left the island immediately.

o When the ancestral species arrived at the island, there was only one food source available and no need for different beak shapes.

o When the ancestral species arrived at the island, there were multiple food sources available, and different beak shapes evolved for the most efficient eating.

o When the ancestral species arrived at the island, there were multiple food sources available, and the different beak shapes were equally efficient for eating different food sources.

Answer 1

The most likely environmental factor that caused this diversity of species is: When the ancestral species arrived at the island, there were multiple food sources available, and different beak shapes evolved for the most efficient eating.