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Homologous organs have similar embryonic origin and basic structure whereas Analogous organs have different embryonic origin and basic structure. Homologous organs may look different and may perform...
http://www.tutorvista.com/content/science/science-ii/heredity-evolution/evolution-classification.php go there... it might help .. :]
because it is!
An organ is one structure that performs a specific function(ex. stomach) and an organ system is a group of organs(ex. digestive system)
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