Active use or disuse of an organ or function, such as the blacksmith's forearm, or the mole's eyes, might also be a source of variation.
These studies examined forced exercise before the onset of initial training20 and disuse associated with stalling21.
Today this practice of singing has fallen into disuse, and the singers of the greater choir sing all the psalms and whatever remains.
Approximately half of the flats there had fallen into disuse by the mid 1980s.
It becomes inaccessible with disuse, but is retrievable with the right cues.
The low rent (icare-i mu'eccele) was normally granted to those who promised to repair a property that had fallen into disuse.
Effects of sensory disuse on geniculate afferents to cat visual cortex.
Words fall into disuse for many reasons, but they rarely disappear altogether, even if their survival is only on paper.
