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the agricultural revolution was historically important because it led to
a) a decrease in population.
b) increases in size of cities.
c) the abandonment of hunting and gathering.
d) permanent settlements and the domestication of animals.

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.

These facilities were organized and sponsored by churches or charities during the great depression in an effort to feed the homeless and needy.

The name of mexico before it won independence