As far as scientists know, the layer of the sun studied during an eclipse is composed of which atoms or subatomic particles? what is the number one mystery about this layer?

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