During inhalation, the thoracic cavity ; during exhalation, the thoracic cavity . Multiple Choice
a. returns to its normal, resting size;
b. becomes smaller than its resting size becomes larger;
c. becomes smaller than its resting size obtains its original size;
d. becomes smaller due to muscles of exhalation becomes larger; returns to its original size

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

What does it mean when a government decides to do something?