- Movement is the characteristic property of living organisms.
- All living organisms move in response to the change in the environment.
- Changes in the environment to which the organisms respond and react are called stimuli.
- The movement of the body parts of organisms in response to the stimuli carefully controlled and co-ordinated.
- The control and co-ordination is controlled by two agencies- I) the nervous system II) hormonal system.
Fig. Nervous system, Hormonal system