Taxis response is to move towards or away from the stimulus. If the organism moves towards the stimulus the taxis is positive, while if it moves away the taxis is negative. For example, flagellate protozoans of the genus "Euglena" move towards a light source. This reaction or behaviour is called "positive phototaxis", since phototaxis refers to a response to light and the organism is moving towards the stimulus. Many types of taxis have been identified, including: 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
Three of a Kind (TV series) Three of a Kind (TV series) Three of a Kind is a British comedy sketch show starring comedians Tracey Ullman, Lenny Henry and David Copperfield. Three series were made by the BBC between 1981 and 1983. The show bolstered the careers of Ullman and Henry, as well as being an outlet for young writers including Rob Grant and Doug Naylor, Ian Hislop and Nick Revell. Ullman and Henry went on to greater success after the show, with Ullman initially launching a brief but successful pop career in 1983 before starring in the ITV sitcom "Girls On Top" in 1985 and