Which solid has only one curved surface and no vertices?

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A Sphere
B Prism
C Cylinder
D Cone

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Answer: A. Sphere

A sphere is made of a single curved surface with no flat faces, no edges and no corners (vertices). A cone also has a curved surface, but it has a flat base and one vertex at its tip, while a cylinder has two flat circular faces.

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Which solid has only one curved surface and no vertices?

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