1. Levels of biological organization
describe terms such as ''cell'', tissue'', ''organs'' and “organ systems''
2. Levels of organization
3. Cell - smallest unit of living things
4. Tissue - group of cells with similar structure and function
5. Organ - group of tissues to perform specific function in organism
6. Groups of organs functioning together make up organs system.
7. All organ systems organize together to compose an organism such as animals, plants