What were the advantages of the Fertile Crescent that made it the earliest site of development for most of the building blocks of...

It had a mild climate. There was an abundance of wild grains that took very little to domesticate. Hunters and gatherers who settled here were able to survive on the abundant grain until agriculture was established. The native plants were easy to reproduce due to self pollination. Hunting and gathering was not highly successful and the soon agriculture was predominant.