Question

multiple choice question
in blood typing,
h\ refers to one of several ______ located on red blood cell membranes.
antigens
antibodies

Explanation:

In blood - typing, Rh factor is an antigen present on the surface of red blood cell membranes. Antigens are substances that can trigger an immune response, and the presence or absence of Rh antigen determines whether a person is Rh - positive or Rh - negative. Antibodies are produced by the immune system in response to antigens and are not located on red blood cell membranes in the context of Rh - typing in the way described in the question.

Answer:

A. antigens