Orcs could reproduce independently. They weren't created by Sauron after all, and were able to maintain a large enough population during the time period between Morgoth's banishment from Arda and Sauron's rise to power after the War of Wrath for Sauron to start using them for his own purposes.
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'See half-brother! This is sharper than thy tongue. Try but once more to usurp my place and the love of my father, and maybe it will rid the Noldor of one who seeks to be the master of thralls.' -Feanor, threatening Fingolfin with his sword. ~Moderator of the Mordor RPG.~
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