Why do so many compounds dissolve in water?

"water is called the "universal solvent" because it dissolves more substances than any other liquid. ...Water molecules have a polar arrangement of the oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge."
" a water molecule is made up of two hydrogen atoms bonded to one oxygen atom. Molecules that have partially charged positive and negative areas are polar. Because water molecules are polar, water can dissolve many other polar substances."

Abay where the river empties into the sea

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.