Final answer:
The three subcultures likely mentioned by Irwin and Cressey are ethnic and racial groups, biker culture, and the body modification community, all offering a shared identity while coexisting within the larger society.
Step-by-step explanation:
The three subcultures identified by Irwin and Cressey that are mentioned in your text are likely based on traditional sociological concepts. Since the exact subcultures by Irwin and Cressey aren't explicitly mentioned in the provided text, we can infer from common sociological studies that these might include ethnic and racial groups, groups united by shared experiences, such as biker culture, and communities with specific characteristics, like the body modification community. These subcultures each offer their members a sense of identity and belonging, though each member also remains a part of the larger society.