1. How do we know if something is living or non-living?
Living Things
How do we know if something is living or non-living?

2. What are 5 characteristics that every living thing has in common?
Please answer this in your notebooks

3. Biology Biology: Study of Life
Scientists that study life are called Biologists
Biologists study 3 important questions: 1) How do living things work? 2) How do living things interact with the environment? 3) How do living things change over time?

4. Characteristics of Life
There are 7 characteristics of life:
Organization and Cells
Response to a Stimulus
Homeostasis
Metabolism
Growth and Development
Reproduction
Change Through Time

5. 1. Organization and Cells
Organization: High degree of order within an organisms internal and external parts ……Ex) Humans
Cells: smallest unit that can perform all of life’s processes
What is the difference between an Unicellular and a Multicellular organism and give me an example of each?

6. Hierarchy of Organization
Within an organism, there is a Hierarchy of Organization.
Organism
Organ System
Organ: Carry out specialized jobs
Tissue: Group of Cells
Cell
Organelle
Biological Model 6

7. 2. Response to a Stimulus What is a stimulus?
Physical or chemical change in the internal or external environment
Why do organisms need to respond to a Stimulus?
TO STAY ALIVE!

8. 3. Homeostasis
Maintenance of a stable level of internal conditions even though environmental conditions are constantly changing
Temp., water content, salinity, acidity, etc

9. 4. Metabolism Energy powers all of life’s processes
Metabolism is defined as the sum of all the chemical reactions that take in and transfer energy
Plants?
Humans?

10. 5. Growth and Development
All living things grow and increase in size
Development is the process by which an organism becomes a mature adult
Cell division is one form of growth and increase.
Forming two cells from one existing

11. 6. Reproduction
All organisms produce new organisms in a process called reproduction
Genes: Short segment of DNA that are passed to offspring
Two ways: Sexual and Asexual

12. 7. Change through Time
Populations of living organisms evolve or change through time to compete or survive