The correct answer to this open question is the following.
You forgot to include the options for this question. However, we can answer the following.
When writing for social studies courses, the style that is required for formatting papers and citing sources is APA style.
We are talking about the American Psychological Association style of writing that established the basis for writing scholarly papers and reports that help researchers and students to order their ideas in a specific and clear way. APA style was created in 1929 to establish guidelines to use in scientific writing and to facilitate the comprehension of ideas. It gives the readers consistency and good formating of ideas.
The NILE RIVER was the <span>geographic feature made possible the union of Upper and Lower Egypt.</span>
38: Shortage
39: Price equilibrium
40: unsure, possibly Utility
41: Diminishing Utility
42: Demand
43: Expenses
44: Opportunity cost
45: Possibly Trade off
46: don't know
47: don't know.
