"A taxis (plural taxes /\u02C8t\u00E6ksi\u02D0z/, from the Ancient Greek \u03C4\u03AC\u03BE\u03B9\u03C2, meaning \"arrangement\") is the movement of an organism in response to a stimulus such as light or the presence of food. Taxes are innate behavioral responses. A taxis differs from a tropism (turning response, often growth towards or away from a stimulus) in that the organism has motility and demonstrates guided movement towards or away from the stimulus source."@en .