What are the advantages to the environment due to continuous movement of nomadic tribes ?

Anser it plzz my frnds. tomorrow is my exam and i need this one

The advantages to the environment due to continuous movement of nomadic tribes were:

• Nomadism allowed to survive bad times and avoid crises
• pastoral movements allowed time for natural restoration of vegetation growth
• Quality of pastures improved with the movement of nomads
• Herds could graze the harvested fields and manure the soils