How are rivers different from other bodies of water?

Pj conducts an experimental study on the effects of soft music during high stakes science testing. he randomly assigns students at the school. in one condition he does not provide music for testing while in the other group he does provide the music. he administers a pretest at the beginning of the year and a posttest at the end of the year. pj’s design is best described as a: a. static group comparisonb. pretest-posttest control group designc. control-group-time-series designd. nonrandomized control-group pretest-posttest design

Why is it difficult to determine which countries belong to europe and which belong to southwest asia

Which of the following is not a country in the middle east (plato) a. armenia b. azerbaijan c. somalia d. sudan