Which contributed to the spread of domestic terrorism? a) improved methods for recruiting new members
b) declining economies in various developing countries
c) civilian unrest due to government-enforced restrictions
d) colonial groups seeking independence from imperialistic powers

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