Question

when the antigens on the surface of red blood cells react with antibodies in the serum, the cells clump together. this process is called: clotting agglutination hemorrhage anemia

Explanation:

Agglutination is the process where antigens on red - blood cells react with antibodies in serum causing cell clumping. Clotting involves the formation of a fibrin clot, hemorrhage is bleeding, and anemia is a deficiency of red - blood cells or hemoglobin.

Answer:

Agglutination