Kim Jong-un, the current leader of North Korea, is trying to improve the economy of the country by
A) introducing new market economy strategies to improve productivity.
B) killing off supporters of his father to strengthen his own control.
C) introducing new military stategies to tighen his control over the country. D) introcuding new communist strategies to tighten his control of the economy.

Donald is studying the eating habits of all students attending his school. he samples the population by dividing the students into groups by grade level and randomly selecting a proportionate number of students from each group. he then collects data from the sample. which type of sampling is used? select the correct answer below: systematic sampling convenience sampling stratified sampling cluster sampling

What does the author describe in this passage

In 1917 ww1 started to happen, and america tried to stay neutral but couldn't. what are the two main reasons america didn't stay neutral during ww1