What were the twelve tables?
the first written collection of roman laws.
the first written record of a constitutional monarchy.
the first recorded instance of a government overthrow.
the first recorded evidence of written language.

The first written collection of Roman laws.

Explanation:

They were in fact more than the first written collection of Roman laws, they were probably the very first complete set of laws written and communicated to the population, so everyone would know the law and be treated fairly and equally, since everyone received the same version of the law, as opposed to laws transmitted orally.  We all know what happens when something is passed on orally: it gets deformed and distorted each time it's passed to another person, since that person puts its own twist and interpretation to it.

a

Explanation:

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.

the constitution gives congress the power to regulate commerce "among" the several states.