Which is NOT one of the competitive event categories of HOSA?

The correct answer is "Environmental Science" because this category does not exist within the competitive events structure of HOSA (Future Health Professionals). HOSA organizes its competitive events into various categories that focus on different aspects of health care and related fields.

The existing categories, such as Health Science and Emergency Preparedness, highlight specific areas critical to health professionals, emphasizing skills and knowledge necessary for success in the health industry. Teamwork, while a vital component in many HOSA events, typically manifests within collaborative events but does not stand alone as a recognized category. Thus, "Environmental Science" is not included in the HOSA competitive event categories, clearly distinguishing it from the other options presented.