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an atom or a group of atoms that has gained or lost one or more electrons and so has an electric charge.
the right and left halves of bilaterally symmetrical organisms are mirror images of each other...
part of cellular respiration: a cyclical series of reactions in which the pyruvic acid formed in...
blood that has no antibodies (blood group AB) and can receive any type of blood.
the region of the kidney where the renal artery enters, and where the renal vein and the ureter...
small solid particles of matter such as soot, ash, metal and dust.