Which is the best description of the difference between the unionist and secessionist viewpoints regarding secession?
a) unionists opposed secession and wished to stay in the union, while secessionists supported secession only if the southern states could secure great britain as an ally.
b) unionists supported secession and wished to unite with other southern states, while secessionists opposed secession and favored cooperation with northern abolitionists.
c) unionists supported secession as a last resort and only if it was done with the full support of all of the southern states, while secessionists opposed secession altogether.
eliminate
d) secessionists believed that secession was the only solution to the issue of preserving slavery and states' rights, while unionists opposed secession and wished to stay in the union.

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.