Final answer:
The end of the most recent glaciation was approximately 12,000 years ago, marking the time when humans started farming and irrigation practices in the Fertile Crescent region.
Step-by-step explanation:
The end of the most recent glaciation occurred approximately 12,000 years ago, which corresponds to the end of the last ice age. Following this period, human societies began to establish settlements in fertile river valleys areas, initiating the Agrarian Age.
The first evidence of farming and irrigation took place in the Fertile Crescent region, particularly in areas such as Mesopotamia near the Tigris and Euphrates rivers and along the Nile River in Egypt.