Which term describes a group set apart due to clear physical differences?

The term that describes a group set apart due to clear physical differences is "racial group." Racial groups are typically identified by observable physical characteristics such as skin color, facial features, and hair type. These physical traits are often used to categorize individuals into different racial categories, which can influence social dynamics, interactions, and societal structure.

In sociology, racial classifications can play significant roles in identity formation and systemic inequality. It is important to note that while race is often perceived as a clear-cut biological distinction, sociologists generally understand it as a social construct influenced by historical and cultural contexts. This construct has led to the development of distinct racial identities and associated social implications.

The other terms in the question do not encompass the aspect of physical differences: "cultural group" relates to shared beliefs and practices; "social class" refers to socio-economic status and related inequalities; and "ethnic group" focuses on shared culture, language, and heritage, which may not necessarily include distinct physical differences.