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a genus of the Protozoa consisting of shapeless unicellular organisms that move by means pseudopodia (false feet), which are bulging parts of the cell membrane
minerals and vitamins that are taken as nutritional supplements to regular food (in the form of...
small solid particles of matter such as soot, ash, metal and dust.
a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...
a connected network of vessels and glands, which carry lymph throughout the body.