A football player was struck by another player in the right flank area just below the posterior rib cage. He complains of severe pain and point tenderness to the area. Your assessment reveals that there is a small amount of blood in his underwear. You should be MOST suspicious for: Select one: a. a ruptured urinary bladder. b. a lacerated liver or spleen. c. external genitalia injury. d. blunt injury to the kidney.

Explanation:

Flank pain refers to discomfort in upper abdomen or back and sides

Explanation:

As given here, that the football player was struck by another player in the right flank area just below the posterior rib cage, By happening so, the football player is feeling sever pain and point tenderness to the area. There is also a small amount of blood in his underwear, these indications show that these can be due to the blunt injury to the kidney.  Kidney injury leads to bleeding inside of the kidney then via urine too. It may also cause pain, tenderness, discoloration of the skin  and many other  problems.

the answer to your question is:

c. complementary base-pairing

it would be heredity