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The rind of the orange is very hard and not easily removable, when compared to that of a tangerine. When it comes to the segments within the peel, those of a tangerine can be separated more easily. Oranges have very few seeds in them. Tangerines, however, are full of seeds.
Read more at Buzzle: http://www.buzzle.com/articles/tangerines-vs-oranges.html