Any practices should best be based on a research - this is the correct answer. (a. child development and research) Research is the best source of actual knowledge, rather than people's best guesses (people's best guesses might lead government regulations, but it would be better if they also followed research results.).
Answer:
Because they are they spread and teach their culture across the region.
Explanation:
The main characteristic of a nomadic tribe is that they constantly move from one place to another in order to seek for new resources.
When they move, they are most likely stayed in one region for a short period of time and communicate with other people in that region. When this happen, cultural assimilation occurs between the nomadic tribes and the local people. Because of this, the activities by nomadic influence greatly influenced the character of the region.
<span>Shasta and Medicine Lake
Shasta and Crater Lake
Lassen and Baker
Adams and Hood</span>