Which of the following is true of antigens? Which of the following is true of antigens? Antigens are produced by the body in response to a foreign invader. Antigens are limited to one antigenic determinant per antigen molecule. Antigens are substances that activate the adaptive immune response. Antigens are typically composed of nucleotides.

Antigens are substances that activate the adaptive immune response.

Explanation:

An antigen is a molecule or a substance that activates or stimulates immune response most especially the adaptive immune system made up of lymphocytes e.g B cells and T cells. The stimulation of lymphocytes leads to  the production of antibodies.

Antigens could either be hetero-antigen (foreign) or auto-antigen (self). Hetero-antigens could be substances produced by microorganisms or certain foods, while auto-antigens are produced in the body. Although the body recognizes auto-antigens, but in autoimmune disorders the body doesn't recognize auto-antigens.

the answer is c) abandoned properties that are contaminated with hazardous materials.

b.