How do fossil fuels form?
a. decomposers remove fossil fuels from dead plants.
b. bacteria fix carbon into fossil fuels.
c. plants release fossil fuels in photosynthesis.
d. dead organisms are compressed by dirt?

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