Which organ of the body is responsible for water absorption * Liver
Heart
Kidneys
Gonads

Technically, it's the kidneys, but if it's also with the digestive system, it would be the large intestine. However, this is not that type of question, so it would be the kidneys.

Explanation:

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.