What instrunent us used in neasuring the mass of substance.​

Five students—jalen, chris, juwan, jimmy, and ray—move into a house together and discover they share the odd habit of drinking milk with ice in it every night before bed. they own several ice trays and make a pact to always refill the trays when they are emptied so that the supply of ice will never run out. but the five often do not have the time or energy to refill the trays, and after a few weeks, it becomes quite common for them to meet in the kitchen and discover that they have no ice. this would best be characterized as what type of dilemma

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.

Arecent challenge to the european union created by a member state is?