What was a soviet city that was eventually conquered by nazi invasion forces

As of 2013, the world’s total population was about

What kind of geography deals with people and how they affect the world ?

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