Based on the attached figure above, I believe that the answer would be OXYGEN and its the first option. The gas that would most likely be found greatest amount in the bubbles is the oxygen, given that the sample given is a plant, this would most likely give off oxygen and take in carbon dioxide. Hope this answer helps.
The two zones are The unsaturated zone and The saturated zone.
The function of the hormone progesterone is to regulate the condition of the inner lining of the uterus in females. I’m pretty sure at least