a visual receptor cell that is sensitive to dim light
lacking cells
(biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals
a device that delivers an electric current as the result of a chemical reaction
a small unit serving as part of or as the nucleus of a larger political movement
a long thin implement made of metal or wood
a linear measure of 16.5 feet
a visual receptor cell that is sensitive to dim light
