An artist will sometimes create CONCEPTUAL unity by unifying the ideas in a work of art.
The answer is b
Hope this will help.
Glass crafts are made by heating sand silica until it melts into a liquid state. The melted glass can then either be shaped by blowing the liquid glass or by pouring the melted glass into a mold. The shape and size of the finished piece depend on the tools and method used by the artist.
Hydrogen, nitrogen, fluorine, oxygen, iodine, chlorine and bromine.
