What characteristics are found in the oldest human populations?

a. they have similar traits to ancestral populations.
b. they carry many unique alleles found only in their groups.
c. they show less assortative mating practices.
d. they show the most genetic diversity.

If there were no system of checks and balance, the process of government would eventually fall apart. do you agree with this opinion? why or why not?

((ᵔᴥᵔ)}[ select all that apply questions! ]{(ᵔᴥᵔ)(1.) which of the following causes of the french government's financial crisis spark the revolution? select all that apply. a.the extravagant spending by the courtb. the cost of the seven years' warc. the expenses of running the bastilled. the cost of aid given to finance the american revolution(2.) despite naming himself emperor, why was napoleon pivotal as a french revolutionary? select all that apply. a. he fostered revolts during his reign. b. he frightened the monarchs of europe with the idea of representative governments. c. he established democracies throughout his empire. d. he established republics that embodied the ideas of the revolution. e. his declaration fueled the ire of the revolutionaries to rise up against him.(｡◕‿‿◕｡)

This is for my social studies guide and i can answer 21/22 of it perfectly fine. but can someone tell me what the caste system was, and what divisions/classes that it was apart of it?