Thom spends a lot of time with his fraternity brothers. the more time he spends with his ingroup, the greater the expectations of

The answer is Conformity.

To complete the sentence (second):

The more time he spends with his in-group, the greater the expectations of conformity.

Conformity stands for the meaning of behavior in accordance with socially accepted standards. In short, to fit in to a group.

answer; a splinter party;

answer; a variety of simple organic compounds could be spontaneously synthesized from components in earths primitive atmosphere;