Racism, sexism, and classism: The uneven terrain of student belonging in introductory biology classrooms.

Sense of belonging supports student success in science, technology, engineering, and mathematics (STEM), yet prior research indicates that systemic inequities shape who feels included in college classrooms. Racism, sexism, and classism can shape students' belonging, which then can impact their outcomes. We studied students' sense of belonging in 56 large introductory biology courses that used active learning, reaching more than 4900 students. We used a QuantCrit methodological framework and hierarchical linear models to examine how the intersection of racism and sexism, and racism and classism, related to three components of students' belonging. Racism impacted groups differently, and its impact varied across intersecting identities and components of belonging. Sexism undermined women's comfort sharing ideas in class and seeking instructor help across racial/ethnic groups. Women in some racial/ethnic groups experienced greater connectedness to classmates than men. Classism diminished students' sense of belonging across most racial/ethnic groups. Disaggregating students into more racial/ethnic groups revealed important differences in the experiences of Native American, Latiné, Black/African, and two groups of Asian students. These findings demonstrate that within the same classroom, students can have profoundly different experiences and challenge us to recognize the influence of intersecting forms of oppression on our students.