What are some ways people depend on the river in south america?

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a study of twenty 4th grade classrooms in which researchers ask the schools to systematically vary the time of day reading is taught, and collect weekly assessments of reading comprehension for each child over a three-month period. the collection of data, by a playground designer hired by the superintendent of schools, about the physical dimensions of school playgrounds, presence of fencing, and the kinds of equipment currently provided. a feasibility study for implementing a year-round school program, focusing on economic issues such a facilities utilization and transportation costs. an analysis of aggregate data comparing statewide high school graduation rates provided by the state department of public instruction, using county tax information.

The region labeled with the number 3 on the map above is best known for being what type of landform? a. a plain b. a plateau c. highlands d. a mountain range select the best answer from the choices provided

Why is the price system a more efficient system for allocating scarce resources than by authoritarian means, such as in command economies?