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The noun would be aeration (adding air to soil or to water). Aeration improves plant growth, and aeration provides oxygen in an aquarium.
aeration can by in many different products such as cakes, breads, baked cereals.
what is the function of aerobic bacteria in the aeration tank
No. THe zone of saturation is below the zone of aeration.
Yes, the zone of aeration is above the zone of saturation.