Understand that organisms are able to respond to changes in their environment
1. Characteristics of life = MRS GREN
S = Sensitivity (how you respond to changes in the environment).
2. Types of changes: Light levels, Temp levels and Chemical Levels.
3. To detect changes, organisms have receptors.
4. To respond to changes, organisms have effectors.
5. Response = the organism is able to survive the changes in the environment.