Notes
- 1.^ Although evolutionary and developmental constraints preclude the possibility of a wheel as part of an organism, they do not preclude the use of foreign objects as "wheels", either instinctually (as in the case of the dung beetles discussed above), or through intelligently directed tool use (as in human technology).
- 2.^ Wheels can be considered to fall into two types: passive and driven. A passive wheel simply rolls freely over a surface, reducing friction when compared with dragging. A driven wheel is powered, and transmits energy to the surface as a means of generating locomotion.
Read more about this topic: Rolling Animals
Famous quotes containing the word notes:
“The soft complaining FLUTE
In dying Notes discovers
The Woes of hopeless Lovers,
Whose Dirge is whisper’d by the warbling LUTE.”
—John Dryden (1631–1700)
“Speech is an arrangement of notes that will never be played again.”
—F. Scott Fitzgerald (1896–1940)
“‘Tis the gift to be simple ‘tis the gift to be free
‘Tis the gift to come down where you ought to be
And when we find ourselves in the place just right
‘Twill be in the valley of love and delight.”
—Unknown. ‘Tis the Gift to Be Simple.
AH. American Hymns Old and New, Vols. I–II. Vol. I, with music; Vol. II, notes on the hymns and biographies of the authors and composers. Albert Christ-Janer, Charles W. Hughes, and Carleton Sprague Smith, eds. (1980)