A coral graft is classified as what type of graft?

A coral graft is classified as a xenograft, which refers to a graft transplanted from one species to a different species. In this case, coral, an organism from the marine ecosystem, is used as a graft material, typically in procedures related to bone regeneration or dental applications.

The distinction lies in the source of the graft. An allograft is tissue transplanted between individuals of the same species, while an autograft is tissue taken from one part of an individual's body and transplanted to another part of the same individual. A composite graft would involve combining different types of tissues, which is not applicable to a coral graft. Thus, the classification of a coral graft as a xenograft is accurate, as it involves the use of biological material from a different species altogether.