How did farmers shape their land to better grow crops in medieval Arabia?

They developed terraces. They built irrigation channels. They worked sheep and camels.

Explanation:

They developed terraces. They built irrigation channels. They worked sheep and camels.

Explanation:

The earliest archeological evidence of irrigation in farming dates to about 6000 B.C. in the Middle East's Jordan Valley (1). It is widely believed that irrigation was being practiced in Egypt at about the same time (6), and the earliest pictorial representation of irrigation is from Egypt around 3100 B.C. (1). Small‐scale irrigation began in the region as early as the late fourth to early third millennium BCE (e.g., Ghalib 1990) and by the first few centuries AD a dam 680 m long and 16 m high diverted water (via two massive sluices at it northern and southern extremities) to irrigate as much as 9,600 ha (Brunner 2000;

answer; i believe the correct answer is prefrontal cortex;