Which documentary photographer took photo's during the great depresion

This medium typically is made of graphite, a crystalline form of carbon:

Which two of the following tasks would most likely be completed by a biomedical engineer

In one to two paragraphs, explain how changing context and interpretation have influenced viewpoints of dorothea lange’s portrait "migrant mother.” in your analysis, be sure to include the photograph’s meaning amid changing social, economic, and political climates, as well as the photograph’s value to photojournalism. include supporting evidence in the form of details, statistics, facts, or quotations.