Answer: Option A) Oxygen may not have been able to accumulate in the atmosphere
Explanation:
Ozone, O3, is an allotrope of oxygen having three atoms in the molecule instead of the usual two present in molecular oxygen. Ozone is generated from oxygen, and is the only form in which oxygen can exist in the atmosphere.
Answer:

Explanation:
<u>Antibiotics:</u>
"Medicines used against bacteria are called antibiotics."
<u>Example:</u>
Rifampin, isoniazid.
Mycobacterium Tuberculosis is a bacteria.
However, some of its strains are resistant to antibiotics and thus is classified as multidrug resistant (MDR resistant)
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Hope this helped!
<h3>~AH1807</h3>
Fat, more specifically, triglyceride which are the main constituents of natural fats and oils in humans and other animals