Which moon has a very thick nitrogen atmosphere, making it somewhat earth-like?
a. titan
b. triton
c. callisto
d. ganymede

The caste system in india was used for what purpose? a) to ensure that all people had an adequate income b) to prevent the rich from taking too much power c) to provide social control and conformity according to one’s birth d) to draft a military capable of defending india from mongol invasion