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when the entire heart, both of the atria and ventricles, is relaxed.
blood that has no antigens (blood group O) and can be given to a person with any blood group....
lasting or continuing throughout the entire year, as a stream.
teeth found at the back of the mouth just in front of the molars in the mammalian jaw, used for...
thin layer of living tissue between the xylem and the phloem, which is able to divide to make...