Searched it up on Google. It says Symbiosis
In the year 1850, Rudolf Virchow was studying cells under a microscope, when he observed that cells were dividing and forming new cells. Realizing what he had observed, he understood that living cells reproduce new cells through division. Basing on his conclusion and realization, Virchow proposed that living cells came only from the other living cells.
The pair of structures that share the function of reabsorbing water into the body us the Hypothalamus and Pancreas.