Use the Following to Answer the Questions Below

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) A reactant and a product in the first step of the urea cycle are, respectively, ornithine and citrulline.
(2) Degradation of heme begins with a ring-opening reaction in which carbon monoxide is produced.
(3) With a normal diet, only about 10 percent of our total calories come from protein.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.