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a hormone produced by the pituitary gland, which helps to limit the amount of water lost from the body in the urine.
the dramatic increase in the human population growth rate over the past two centuries.
a disease caused by the human immunodeficiency virus (HIV).
a kingdom of plant-like unicellular and multicellular organisms that do not contain chlorophyll...
the excessive growth of alga and hydrophytes in response to the addition of artificial or...