In which social stratification system does a person marry only people within their same group?
meritocracy
castes
social class
open systems

Castes

A caste system is a social stratification system characterized by endogamy (marrying only within a person's own social group), hereditary transmission of lifestyle (such as occupation) and other ways of social interaction. Caste systems exist in many areas of the world. However, the paradigmatic example is often that of India.

i would say that these are the two thesis statements best for a literary analysis essay on recurring themes in shakespeare's romeo and juliet:

1.  in romeo and juliet, shakespeare demonstrates that love comes in a variety of forms, be it romantic, familial, or between friends.

2.  shakespeare explores the struggle for identity through the character of juliet in his play romeo and juliet.

the other theses aren't reoccurring in this play. 

explanation:

the answer should be:

the intervention of the supernatural gives gilgamesh hope that he will defeat humbaba.