A sphere is a three-dimensional shape with one surface.
Or:
An irregular blob, an ellipsoid, a torus, plus other shapes.
The most interesting 3D object with only one side is of course the Moebus strip.
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An 8-faced 3D shape is called an octahedron. It is a polyhedron with eight triangular faces, 12 edges, and six vertices.
The protein would have a tertiary structure. This structure results from the unique folding of the single polypeptide chain into a 3D shape, giving the protein its functional conformation.
triangular prism
The atomic sphere.
To make a 3D model of a planet, you can use software like Blender or SketchUp to create the sphere representing the planet's shape. You can then apply textures and colors to the sphere to mimic the planet's surface features. Adding details like mountains, craters, and atmospheres can enhance the realism of the model.