Examlex
Which one of the following is not one of the five gaseous components in highest concentration in the atmosphere?
Stress
The experience of emotional or mental pressure due to tough or unfavorable conditions.
Physical Illness
Physical illness is a condition that impairs the normal functioning of the body, often characterized by specific symptoms and signs.
Health Research
The systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions regarding health and disease.
Smoking
The act of inhaling and exhaling the smoke of burning plant material, typically tobacco, which is a known health risk.
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