During digestion, water is both added and removed. which area of the digestive system removes water?

Large Intestine

Explanation:

Water from the undigested food is removed by the large intestine. All the nutrients have been absorbed from the food before it reaches large intestine.

Large intestine removes water and make stool consistent enough so that it is easily removed.

There are three main parts of large intestine

a) Cecum - cecum has no major role in food digestion. It passes the food to the colon

b) Colon  - It has three sub parts

     i. the ascending colon - Bacteria in colon digest the remaining food

     ii. the transverse colon - It absorbs fluid and salts

     iii. the descending colon - hold the waste

c) rectum

located offshore, in the arctic and pacific oceans

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."