The advantage to having a forked tongue is that more surface area is available for the chemicals to contact and the potential for tropotaxis.
2.
Snake tongues are bifurcated, or forked, to enhance their ability to pick up pheromones by means of tropotaxis, and sometimes must travel a great distance to find a female.
3.
Depending on the type of sensory organs present, a taxis can be classified as a "'klinotaxis "', where an organism continuously samples the environment to determine the direction of a stimulus; a "'tropotaxis "', where bilateral sense organs are used to determine the stimulus direction; and "'telotaxis "', where a single organ suffices to establish the orientation of stimulus.
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