|In the study group's junior year at Greendale Community College they all agree to take the subject Biology together. The textbook required for the course is "Biology: Principles and Perspectives" published by Kendall/Hunt. Its first appearance was in the Season Three episode "Biology 101" and its last appearance was in the season finale "Introduction to Finality".|
"Anthropology 101": Jeff points out the Biology textbook to Britta who has a Chemistry textbook by mistake.
"Competitive Ecology": The Study Group are all seen with the textbook when they fail the terrarium assignment.
"Course Listing Unavailable": Jeff cries into his Biology textbook when Dean Pelton breaks the news that their grades are incomplete and they'll have to re-take Biology again in the summer.