A non polyhedron does not have these properties, maybe it is not closed, maybe one or more of the sides is a curved surface. In some branches of topology the sides of a polyhedron cannot intersect each other.
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A non polyhedron with 0 bases is a sphere.
A polyhedron has "many sides" (by definiton). The only 3-D shape which does not have "many sides" is a sphere (which technically only have one "side").
A cylinder is one example.
No, they are the faces of the polyhedron.
It is a prism with non-polygonal bases. The bases simply be two identically shaped "blobby" shapes.