Final answer:
Transplanting tissue or organs from one species to another is known as xenotransplantation, which faces challenges such as transplant rejection, but advances in genetics and regenerative medicine are seeking to address these issues.
Step-by-step explanation:
Transplanting a tissue or organ from one species into another species is known as xenotransplantation. This technique is distinguished from other forms of transplantation such as allografts, where organs or tissues are transplanted within the same species, and autografts, where the donor and recipient are the same individual.
Despite the potential health benefits, xenotransplantation comes with significant challenges, including transplant rejection due to differences in Major Histocompatibility Complex (MHC) molecules. Modern advances in biotechnology are seeking to overcome these challenges through genetic modification of donor animals and the use of regenerative medicine techniques to create organs with the individual's own cells.