Rob is doing a research project for school. He is using this question to guide his research: In what ways is the island of Madagascar unique in the world?
Which information is most relevant to his work?

1. Madagascar is an island located in the Indian Ocean.

2.The aye-aye, a mammal, exists only on the island of Madagascar

3.The island's population is made up of many different ethnic groups.

4.The island's transportation includes trains, planes, boats, and motor vehicles.