1. What is life?

2. With your neighbor, make a list of as many living things that you can think of.
What do they all have in common?

3. SIX Characteristics of Living Things
Cellular organization
Growth and development
Reproduction
Responds to Stimuli
Homeostasis
Energy

4. #1 Cellular Organization
All organisms are made of cells
Cell is basic unit of structure and function in an organism
Unicellular – single-celled organism, bacteria
Multicellular – many cells that are specialized to do specific tasks

5. #2 Growth and Development
Growth – process of becoming bigger
Development – develop change over time (mature)—or get more complex

6. #3 Reproduction
Living organisms can reproduce and produce offspring that are similar to the parents

7. #4 Response to Surroundings
Living organisms respond to stimuli
Examples: temperature, light, sound
The factor that causes the organism to react is called a stimulus.
The reaction an organism has is called the response.

8. #5 Homeostasis All living things maintain stable internal conditions
Cells need certain conditions to function properly
There is a limit to the amount of change that can occur in an organism
Examples
What happens when you get hot?

9. #3 Energy Use
Cells must use energy to carry out their everyday activities
Repair injuries, muscles moving, transport
The ultimate source of energy is the sun

10. Life comes from Life
Living things arise from living things through reproduction.
Hundreds of years ago, people believe in spontaneous generation – the idea that living things could arise from nonliving

11. Redi’s experiment Italian doctor in the 1600s, Francesco Redi
Flies do not spontaneously arise from decaying meat

12. Pasteur’s Experiment French chemist Louis Pasteur, mid 1800s
Showed that new bacteria appeared in broth only when they were produced by existing bacteria

13. All living things need water to survive.
Your own body is about 66% water.
Water in your blood helps transport food, and chemicals to your cells.
It helps remove waste products from your body.
Water is used to cool you down, to warm you up, and to carry out the chemical reactions that allow you to move and grow.

14. Organisms use food as their energy source
Consumers: Cannot make their own food
Heterotrophs
Producers: Produce own food through photosynthesis
Autotrophs
The food organisms take in provides them with energy, and raw materials they need to:
build their bodies
grow
repair damage

15. Habitat A home A place to live where they can find
Food, water and shelter

17. How do living things maintain homeostasis?
All organisms need to maintain a stable internal environment called homeostasis.
How do living things maintain homeostasis?
When your body temperature begins to rise, what happens?
You begin to sweat.
Sweating is your bodies way of cooling down, and thus maintaining homeostasis