Wasn't it said that Uruk-Hai came from the breeding of Orcs and Goblin men? I believe the first orcs were probably immortal due to the Elvish blood in them. Although they were corrupted, you can't really take immortality away from the blood.
Feel free to comment or disagree.
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"And he sang to them, now in the Elven tongue, now in the speech of the West, until their hearts, wounded with sweet words, overflowed, and their joy was like swords, and they passed in thought out to regions where pain and delight flow together and tears are the very wine of blessedness."
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