what are the four adaptations that were cited as being selected for by “life in the trees” or “grabbing bugs”?

what are the four adaptations that were cited as being selected for by “life in the trees” or “grabbing bugs”? (furthermore, what were the proper names for those two evolution of primate scenarios, and who were proponents of each? which is most popular now? why?)
this is a study guide question word for word any help would be great