In Snyder's study on social expectancies, the results indicated that if a male participant saw an photograph, the female participant was likely to have behaved in a manner that was rated as warm, poised, and humorous.

Attractive; more

Explanation:

According to Snyder this effect can be regarded as a different form of self-fulfilling prophecy. females who are attractive are expected to exhibit friendly as well as warm behaviours. these group of females who are seen as attractive are treated in such a way that they begin to actually act back in that way. self-fulfilling prophecy are expectations that people use when interacting with other persons. They use this expectations as action guides. Beliefs as well as actions would create its own reality.

answer; how people relate to each other and influence each other;

answer; the changing age structure of the population;