What is thr research question for the study of pollution reduction

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 economy of the united states is best described as

"martin luther king, jr. was buried the day after my first child was born, my daughter brooke. she was born april the eighth of 1968. i went from the hospital to the grave. and i spent three days thinking about what i was going to do with my life and decided that politics, although not perfect, was the best available nonviolent means of changing how we live. " - maynard jackson, 1990 which statement best explains how maynard jackson's 1968 decision foretold his future? question 8 options: he was elected mayor of atlanta in 1973 he was elected governor of georgia in 1990. he started his own bond and security business he removed segregation signs form water fountains at city hall