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Democritus said that, although we imagine many things, "in reality, there are only atoms and the void." This idea could best be classified as
Periosteum
A dense layer of vascular connective tissue enveloping the bones except at the surfaces of the joints.
Articulation
Place where two bones come together; also called joint.
Joint
A point where two or more bones meet in the body, allowing for movement and support.
Cavity
An empty or unfilled space within a solid object or body, often referring to holes in teeth caused by decay.
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