After one half life 20g of a parent isotope remain how many grams were in the orginal sample

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

Growth of the business (be sure to use the terms “culture” and “cultural diffusion” in this section.) of debbie fields. plz me

Which group of georgians would have been most likely to support lester maddox? african americans women white men political activists