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the number of people per unit area.
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as...
small solid particles of matter such as soot, ash, metal and dust.
the forming new plants asexually (without the production of seeds or spores).
the blood circuit from the heart to the lungs and back to the heart.