Emergency Medical Technician (EMT) Medical MCQs Rescue 1122 Oxygen is an odorless & colorless gas, present in the atmosphere at …..and is essential for life. November 5, 2021 Admin No Comments A: 21% B: 25% C: 20% D: 30% Correct Answer: a Short Details: Oxygen 21% Nitrogen 78% Argon 0.9% View More Details >>
