Explain why geographers often break the world into cultural regions. What can they learn by doing this, and how can they use the information? Your answer should include no less than four complete sentences.

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