Answer:
d
Explanation:
because its food that i choke on
I believe that the right answer is Heat energy
Antigen: is a a foreign substance or toxin that causes a immune response.
Antibody: it is a blood protein that is produced in response to an antigen.
White blood cell: also called a leukocyte and is a cell that counteracts against antigens.
Specific: If your're talking about the biology definition then it is, of or pertaining to a species.
Pathogen: a virus or bacteria that can cause a disease.
Animals are multicellular, we are heterotrophic
