This link can help you: https://answers.yahoo.com/question/index?qid=20090922111731AAhZXg7
Their livilihood depended on that.
It won't let me go to the link..
They could rest assured that their food supply was more stable and constant if they planted consistently. To do this they learned to observe the stars and seasons to be ready for planting and harvesting. They fought over and secured land that was arable and then protected it with military might to protect their food supply. To that end..... 2 the early farmers became specialized in their labor and became potters, tanners, government leaders, accountants (well, they could count anyway!) and the myriad of other jobs that a modern community needed to survive. They took time to learn their tasks (education) and practiced those in communities governed by those whom they empowered. By the time you get to ancient Egypt, the range of jobs was pretty diverse for this largest and most successful agrarian society. 3 Early farmers also began to think seriously about continuity and a lasting society, so they worked hard on laws and taught their children respect for their society. Then they thought about the need for more land and growing the size of their kingdoms to ensure its permanence.
Agriculture was their livilihood!
It says that on the link
Can I get a medal.
Because when they domesticated their plants and animals the animals became easier to breed and tame and the plants would become more beneficial to the people. For example the typical household dog originated from the wolf but over time domestication changed the wolf breed into what we have now and as for the plants here's another example... Corn used to not be corn it was originally just grass but when people domesticated it over time they got what we now know as corn/sweet corn
Hope i was helpful.