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Their gills type electrochemical gradients that mediate salt excretion in salt water and uptake in fresh water. a hundred and eighty The physiology of fish is also specially tailored to compensate for environmental salt ranges by means of osmoregulation. one hundred eighty Aquatic crops exhibit all kinds of morphological and physiological adaptations that allow them to outlive, compete, and diversify in these environments.
When soils are flooded, they quickly lose oxygen, becoming hypoxic (an atmosphere with O2 concentration beneath 2 mg/liter) and eventually fully anoxic where anaerobic bacteria thrive