Which of the following grafts (transplant tissues) would be taken from elsewhere in a person's body?
a. allograft
b. autograft
c. isograft
d. xenograft

Allograft, Isograft and Xenograft.

Explanation: Grafting can be defined as a surgical procedure that is used to move a tissue from one part of the body to another or from another organism without bringing the blood supply along with the tissue.

Here, the grafting in which a piece of tissue or organ from another organism is introduced to person's body can be allograft, isograft and xenograft.

Allograft can be defined implanting tissue or organ from another individual of same species.

Isograft can be defined as implanting tissue or organ from genetically identical individual.

Xenograft can be defined as implantation of tissue or organ from different species.

So, the correct options are A, C and D

carbon atoms, hydrogen, oxygen, and nitrogen.