Lissette wonders whether personality differences between her african american and asian american friends result from biological or cultural influences. in this instance, lissette is primarily concerned with the relative contributions of
nature and nurture

Lissette is primarily concerned with the relative contributions of nature and nurture.

Explanation:

Nature vs nurture theory is a debate which aims to explain if an individual's behaviors and personality is developed by nature (genetics, biological predispositions) or nurture (influence of his/her environment).

In this case Lissette is wondering wether her African American and Asian American friends' personalities are a result from biological (nature) or cultural (nurture) influences.

the correct answer is modern american cars are not available due to trade restrictions.

trade between cuba and the united states have serious restrictions. the u.s. imposed an economic embargo on cuba, that among other things means that modern american cars are not available due to trade restrictions.

in response to some governmental actions of the authorities from cuba, president john f. kennedy proclaimed an embargo on trade between both countries in february 1962. the trade embargo remains active until this day and was implemented directly by the departments of commerce and the department of treasury.

in president trump’s administration, there is a national security presidential memorandum that "strengthens the policy of the u. s.", affecting trade with cuba.