| − | '''Taxis''' is the movement of organisms either toward or away from a stimulus, such as light (phototaxis), heat (thermotaxis), chemicals (chemotaxis), gravity (geotaxis), and touch (thigmotaxis). | + | '''Taxis''' is the movement of organisms either toward or away from a stimulus, such as [[light]] (phototaxis), [[heat]] (thermotaxis), [[chemicals]] (chemotaxis), [[gravity]] (geotaxis), and [[touch]] (thigmotaxis). |