1. Chapter 1
What is life?

2. The Characteristics of Living Things
Vocabulary
Organism-all living things
All living things:
Have cellular organization
Contain similar chemicals
Use energy
Grow and develop
Respond to their surroundings
Reproduce
The Characteristics of Living Things

3. All organisms are made of small building blocks called cells Cells are the basic units of function and structure in an organism
Plant cell
Animal Cell
Organisms may be composed of ONE or MANY cells MULTI-cellular: composed of MANY cells UNI-cellular: composed of ONE cell (single-celled)

4. UNI-cellular (single-celled)
MULTI- cellular
Bacteria: most numerous organism on Earth one cell carries out all the functions necessary for the organism to stay alive
Specialized cells: used for certain tasks EX- nerve cells, muscle cells, skin cells, etc *animals are multi-cellular*

6. *Growth and Development*
Growth-the process of becoming larger
Development-the process of change that occurs during life to produce a more complex organism
In order to grow and develop, organisms need to use ENERGY to create new cells
*Growth and Development*

7. Response to Surrounding
STIMULUS
RESPONSE
A change in an organisms surroundings that cause it to react
An action or change in behavior
Response to Surrounding

8. Organisms reproduce to create offspring that are similar to their parents EX: Birds lay eggs Plants produce seeds which grow into the same type of plant – to produce their own seeds Bacteria produce other bacteria exactly like itself
Reproduction