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single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell walls that contain silica.
reactions in which smaller simpler molecules joint form larger,complex molecules
an injection of a weakened or dead pathogen into the body to build up immunity against a disease...
simple inorganic chemical substances (mineral salts) that are needed in very small amounts for...
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...