2.76 Sensitivity

1. Organisms are able to respond to changes in the environment
2. The types of changes in the environment include changes in light levels, temperature, pressure levels and chemicals. 
3. In order to detect these changes in the environment organisms have receptors.
4. In order to respond to the changes in the environment organisms have effectors such as muscles and glands. 
5. It is the response that ensures that the organism is able to survive the changes in the environment.