What is the need for a system of control and coordination in an organism?
Living things show different types of movements. These movements may be due to growth, in response to change in environment or to procure food. Each kind of a change in the environment evokes an appropriate movement in response. For example, a cat must run faster than the rat to catch it. Thus, control over movements in response of environment is necessary. Moreover, movements made by different parts of the multicellular body must be coordinated. We need coordination of fingers and thumb to hold a pen. So, multicellular organisms need specialised tissue to provide control and coordination.
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