Why aren’t the snakes growing and thriving in the forest ecosystem?

When were the exodus of farm workers during the depression

What was the focus of debate about the war at the second

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