Final answer:
Oxygen has the most varying atmospheric concentration compared to other gases like methane, argon, and nitrogen.
Explanation:
Oxygen has the most varying concentration in its atmospheric presence compared to methane, argon, and nitrogen. Ozone, for instance, fluctuates in concentration due to factors like time of day, O atoms from other sources, and altitude. On the other hand, carbon dioxide has a fairly uniform global presence but is increasing yearly due to fossil fuel burning.
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