1. Characteristics of Living Things
How do we know if something is alive?

2. Characteristics of Living Things
All living things must be able to obtain and use energy.
All living things must be able to reproduce.
All living things must be able to respond and adapt to their environment.
All living things must be able to grow and develop.
All living things must be composed of cells (or be a cell).

3. Classifying Living Things
When we study different aspects of living things, we tend to classify them based on their complexity. Place the following in increasing order of complexity:
Cell Organ Organ System
Organism Tissue

4. Cell
Most basic unit of life.

5. Tissue
Groups of cells clustered together.

6. Organ
Collections of tissue with similar functions.

7. Organ System
Several organs working together to perform a certain function.

8. Organism
You!

9. Types of Cells