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the very cold zone in an ocean, dam or a lake, located below the range of effective light penetration (the limnetic zone).
the factor that changes in an investigation and is not under the control of the investigator....
an individual who donates an organ for the purpose of transplanting it into another person in an...
the first step of cellular respiration in which glucose is converted to pyruvic acid with small...
the protective layer of fibrous connective tissue which surrounds each kidney.