How did some political leaders attempt to fight injustice in the days before the civil rights movement?.

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

Roman builders used rows of arches in there buildings to form a curved ceiling called what

4. write short introduction to aaran and jaanto technology.