The correct word is which?
This website has information on forms of Human observation to be pretty broad. It doesn't have anything specific with Bolivian villagers or there looms.
http://www.psychologydiscussion.net/behaviour/7-methods-of-studying-human-behaviour/540
I believe the answer is cause
Answer: Clauses can be divided into two kinds: dependent and independent. A dependent clause contains a subject and verb, but cannot stand on its own as a complete sentence; an independent clause includes a subject and a verb, and expresses a complete thought.
Explanation: