Throughout college and even while attending law school, Devon always dressed very casually, sported long hair, and had a number of rings in his nose. When he had the opportunity to work with a prestigious law firm for the summer, he changed his appearance quite radically. Now, he wears three-piece suits and silk ties and has short hair and no nose rings.
This change in Devon's behavior related to his appearance is likely motivated by .

Normative social influence                      

Explanation:

Normative social conditioning requires a behavioural shift that is considered necessary to blend within a specific group. The desire for a good interaction with the surrounding people contributes to compliance.

It also contributes to individuals displaying public obedience, but not generally private approval of the societal standards of the population for the community to embrace.

Societal norms apply to the uncodified laws regulating social behaviour. These are traditional behavioural norms which are commonly adopted by participants of a community.  

as university of miami psychologists debra lieberman and adam smith pointed out in a recent article in the journal current directions in psychological science, humans have social and psychological mechanisms to deter incest. with very few exceptions, marriages between brothers and sisters and between parents and their children are verboten in every human culture. the primary psychological anti-incest mechanism is the yuck response. even the idea of sex with their mom or dad, bro or sis is upsetting to most people. the psychologist jonathan haidt has found that nearly everyone is repelled by the prospect of brother-sister sex, even in hypothetical situations in which there is no chance of pregnancy).

the biological cost of incest

this raises an interesting question: just what’s so bad about incest? sure, having sex with your dad or your sister seems gross — but why? some anthropologists have argued that incest taboos are learned social conventions. this explanation, however, doesn’t make sense to me as it does not explain the widespread existence of anti-incest mechanisms in creatures ranging from cockroaches to chimpanzees. second, the incest taboo is about as close to a universal law as human moral rules get.

why should mechanisms to avoid incest be so widespread both in nature and across human societies? the answer is simple. the problem with having sex close with relatives is that there is an astonishingly high chance that your offspring will be born with a serious birth defect.

the most likely outcome of fewer loon territories is that hawks would increase in proportion because the benefit of victory would be greater. hawks and loons are natural rivals of resources and victories in the game, since the lakes drying up affected the loons, the hawks would be benefited from the drought.