2. How do scientist like archeologist as well as Historians study early history and
prehistory?

Archaeologists use modern technology to interpret their findings. Historians study how people lived in the past, like what they wore or ate. Like archaeologists, historians analyze artifacts, from housing and coins to artwork.  

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.

the answer is