Final answer:
Xenotransplantation is the process of grafting organs or tissues between different species. The first case of xenotransplantation on a human being was performed in 1963.
Step-by-step explanation:
The term xenotransplantation refers to the process of grafting or transplanting organs or tissues between members of different species. The first case of xenotransplantation on a human being was performed in 1963. Prior to that, the first successful organ transplantation between two humans took place in 1954.