Define anterior and posterior in correlation to the body. (ANATOMY)

Anterior refers to the side of the structure facing up in the standard anatomical position while posterior refers to the bottom side. ... Dorsal and ventral are sometimes used in place of anterior and posterior, respectively. Dorsal means the back side or upper side, while ventral means the frontal or lower side.

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explanation:

the atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.