Did not occur after the last american troops left vietnam

the north vietnamese and the south vietnamese continue fighting

south vietnam surrender to north vietnam

henry kissinger met with north vietnamese and viet cong leaders in paris

vietnam was united under a communist government

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.

Can someone me answer all the questions?

Perculiarity of globalization for the global economy