1. Characteristics of Life

2. Unifying themes of biology
Section 1.2
Unifying themes of biology

3. All living things share certain characteristics
Made of Cells:
Some are unicellular, but most are multi-cellular.

4. Respond to a Stimulus:
Stimulus  anything (internal of external) that causes a response
Response  an internal or external reaction

5. Need for Energy Chemical Energy
Producers – use sunlight to create their own food
Consumers – get their energy from other sources
Metabolism – chemical processes that build up or break down materials

6. Reproduce The ability to make new individuals and pass on DNA
Asexual vs. Sexual

7. Necessary for survival
Homeostasis
Maintaining constant internal conditions
Body temp, blood sugar, acidity