I'm stuck on these---

9. Most of the end products of digestion are absorbed into the circulatory system from which organ?
a. liver
b. pancreas
c. large intestine
d. small intestine

11. Pancreas is to small enzymes as
a. stomach is to saliva
b. stomach is to proteins from amino acids
c. liver is to bile
d. liver is to hydrochloric acid

12. Ureter is to urinary bladder as
a. urinary bladder is to ureter
b. uretha is to urinary bladder
c. uretha is to ureter
d. urinary bladder is to uretha

Please help

Thanks
-MC