Blood types are determined by the presence or absence of three antigens: A antigen, B antigen, and an antigen called the Rh factor. The resulting blood types are classified as follows:

type A if the A antigen is present

type B if the B antigen is present

type AB if both the A and B antigens are present

type O if neither the A nor the B antigen is present

These types are further classified as Rh-positive if the Rh-factor antigen is present and Rh-negative otherwise.

(a) Draw a Venn diagram that illustrates this classification scheme.

(b) Identify the blood type determined by each region of the Venn diagram (such as A⁺ to indicate type A, Rh-positive).

(c) Use Google or another source to find what percentage of the U.S. population has each blood type.