I believe the answer would be by radio. I hope this helps!
Answer:
Solid casting, the use of solid wax models limited the founder to casting very small figures.
Andrea Mantegna, and Vincent Van Gogh,Thomas Eakins,Anna Boch,Kate Greenway,Mary Stevenson Cassatt,Hannah Hoch,and Kurt Schwitters. These are all the artists known for their collages.
Heterogenous Mixture are not uniform in composition, ex: Granola Bar, Pizza, Cookies