Answer:
we can get different benefit
we can get the goods in cheap price
Because reflexes permit faster responses without having to bypass several synapses the higher reasoning or conscious thought is not necessary or desirable features of reflexes. The importance of reflexes is to cause something to happen. speed of prime importance, not information. You don't care how hot the stove is that in your hand is on, you just want to get that hand off the stove as fast as possible. Our reflexes enable us to survive. Adding an intervening layer of thought is to get us into trouble.
I believe the answer is: local language
The main job of ethnographers is to explore and understand the cultural phenomenon that happen in one society. In order to obtain the full information, ethnographers need to directly communicate with the local people. Since we cannot expect them to learn our language, it is much better if we as ethnographers learn their language instead.
B/c they were the first people in canada and started the fur trade also they helped the europeans surive the harsh winters