In general, where groups remain culturally or physically distinct, mobility between ethnic strata is:
a. enhanced.
b. limited.
c. neutral.
d. destroyed

b. limited.

Explanation:

Ethnicity refers to the social groups who share the same culture or nation. Social groups who remained culturally distinct develops stereotypes about the other groups belonging to different ethnicity. These stereotypes segregate the social groups on an ethnic basis and therefore the movement among different strata becomes limited.

aliens are not real, the myth was created about 700 years ago because people found markings in the field of their crops. also, no there were no aliens on the moon.

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swahili is an extremely rich and complex civilization, a set of ethnic groups articulated by a language and a series of cultural elements that fuse the african traditions, islam and indian culture. this growth was largely a result of the indian ocean trading network that brought in not just man-made riches, but also religious ideas, specifically islam, which had a significant impact on the local culture. furthermore, the development of the swahili language gave a common cultural unity to the people.