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an individual who donates an organ for the purpose of transplanting it into another person in an attempt to save their life.
two species that interact symbiotically in a relationship that is beneficial to both species....
simple epithelium with flattened cells found in the inner lining of the mouth, oesophagus and...
extremely hard, calcium-rich substance which covers the crown of the tooth.
a type of nuclear division during which reproductive cells divide to produce gametes. The...