evolutionary biology course at a small university small has 17 seniors and 13 juniors. The instructor would like to send 10 students to a Global Public Health Conference. The instructor is interested in sending 4 junior and 6 senior students.  Of the 17 senior students, 6 are selected randomly, and then 4 junior students are randomly selected from the 13.Which of the following best describes the sampling design? a. none of the above b. simple random sampling c. convenience sampling d. stratified sampling

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