Red Seal Cosmetology Practice Exam

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What does the 'O' in COHNS stand for?

Oxygen
Osmium
Olive
Ozone

The correct answer is: Oxygen

COHNS is an acronym used to remember the five most abundant chemical elements in living organisms Carbon, Oxygen, Hydrogen, Nitrogen, and Sulfur. The 'O' in COHNS stands for Oxygen because oxygen is the most abundant element in the Earth's crust and is a vital component in many biological processes. The other options, including Osmium, Olive, and Ozone, are not part of the COHNS acronym and are not considered to be abundant elements in living organisms. Additionally, while oxygen can exist in different forms, such as ozone, it is not referred to as Ozone in the COHNS acronym. This makes option A, Oxygen, the most appropriate and accurate answer.