What are blood group substances

Blood Group Substances: Their Chemistry and Immunochemistry focuses on the characteristics, reactions, sources, and transformations of blood group substances. The book first offers information on human blood group factors and the methods and reagents used in testing for blood group antibodies and antigens.

Human blood is grouped into four types: A, B, AB, and O. Each letter refers to a kind of antigen, or protein, on the surface of red blood cells. For example, the surface of red blood cells in Type A blood has antigens known as A-antigens.

Explanation:

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

wait any answer choices plz