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single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell walls that contain silica.
organisms whose cells have a true nucleus and true organelles. These structures are not...
variation due to the small differences in the genes that control each feature and characteristic...
epithelial tissue that lines the inner spaces of the body or organs.
microscopic canals running longitudinally through compact bone tissue that contain blood vessels...