The term he used of having to assert that humans have an
inborn mechanism in which they have the capability of mastering language is
called the language acquisition device. This is a tool in which an individual
has that enables them to learn or acquire language that they may be able to
understand them.
I believe the answer is: Relationship building
understanding similarities and differences serve two important functions in relationship building. The first one is to create a sense of tolerance between different group of people. The second one is to help them achieve tolerable compromise during negotiation rather than conflict.
I’m guessing SURVIVAL because ancestors wouldn’t make sense since the question says they won’t have to focus on finding food.