1. All organisms share certain characteristics.
Biology is the scientific study of all forms of life.

2. An organism is any individual living thing and
Living things share the same certain characteristics.

3. All are made of one or more cells.
These are the following characteristics shared between living organisms:
All are made of one or more cells.
All need energy for metabolism.
All respond to their environment.
All have reproduction and development.

4. A cell is the most basic unit of life
Unicellular organisms, like bacteria, carry out all of life’s essential functions
Multicellular organisms, like buffalo, cells work together to carry out complex tasks

5. Need for Energy All organisms need energy to carry out life processes.
Chemical energy is used by all living things
How do humans use chemical energy? Plants and algae?
Chemical energy is important for metabolism
Metabolism is the chemical processes that build up or break down materials to maintain life.

6. Organisms must respond to stimuli in the environment to survive
All respond to their environment.
Organisms must respond to stimuli in the environment to survive
Examples:
Light
Temperature
Touch

7. All organisms have DNA that they pass on to offspring.
Members of a species must be able to reproduce
During reproduction organisms pass on their DNA, genetic information
Organisms have various methods of reproduction

8. Review
What characteristics are shared by all living things?

9. Knowledge of biology helps you understand your health: food allergies
Your health and the health of the environment depend on your knowledge of biology.
Knowledge of biology helps you understand your health:
food allergies
potential effects of obesity
effects of alcohol, tobacco, and other drugs
cancer
brain
lungs
heart
liver
kidneys
Nonsmoker enzyme levels
Smoker enzyme levels