Which of the following is one of the basic principles of social stratification?
a. low-level groups often have basic access to the rewards and privileges of higher-level groups.
b. it is maintained through beliefs that are widely shared in a society.
c. all societies stratify according to wealth accumulation.
d. families’ social positions start anew with each new generation.

The correct answer is option b. "It is maintained through beliefs that are widely shared in a society".

Explanation:

Social stratification is a people's differentiation according to its socioeconomic strata, directly affected by its wealth and social status. One of the principles of social stratification is that it is maintained through beliefs that are widely shared in a society. The existence of the different strata is maintained by people's believing in them, as people is rise with the idea of its existence and this idea is passed from generation to generation.

identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.