You can answer this by reading in Chapter 8. Diamond lists the Fertile Crescent's advantages beginning on p. 136 in the paperback edition of the book. These advantages include:
- It has a Mediterranean climate that is a very good habitat for plants that are useful to people. In fact, it has the largest zone of such climate in the world.
- It had many plants that were easy to domesticate.
- Its climate varies more from year to year and season to season than that of any other Mediterranean zone.
- It has many different altitudes and topographies within a relatively short distance of one another.
- It also had more big animals that could be domesticated.
- The area did not have enough resources to be really good for hunter-gatherers. This meant societies that started to farm did not have to compete with hunter-gatherers.