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kidney
A heart.
A kidney.
A kidney.
A kidney
The first successful organ transplant occurred in 1954, when a man donated one of his kidneys to his twin brother.
The first successful transplant in 1950 was a kidney. The transplant was done at Little Company of Mary Hospital on June 17, 1950.
kidney
According to records, they were the first humans to successfully fly a plane in America.
anus
December 2nd 1982
The first one that comes to mind is hydrochloric acid, which is essential to digestion.