1. What is life?

2. What is Life?
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
The chemicals of life
Energy use
Response to surroundings
Growth and development
Reproduction

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 Chemicals of Life Cells are composed of common chemicals:
Water – most abundant chemical in the body
Carbohydrates – energy
Proteins and Lipids - building blocks/energy source
Nucleic acids - genetic information/DNA

6. #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

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

9. Organisms get larger by using materials and energy from the environment.
Growth occurs through cellular division and cell enlargement.

10. #6 Reproduction
Living organisms can reproduce and produce offspring that are similar to the parents

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

12. Redi’s experiment Italian doctor in the 1600s, Francesco Redi
Flies do not spontaneously arise from decaying meat—so life comes from life!

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

14. The needs of living things
Water
Food
Living Space
Homeostasis

15. 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. Also where chemical reactions in body occur
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.

16. Organisms use food as their energy source
Consumers: Eat other organisms
(Heterotrophs)—ex. A lion
Producers: Produce own food through photosynthesis
(Autotrophs)—ex. A plant
The food organisms take in provides them with energy, and raw materials they need to:
build their bodies (tissues)
grow
repair damage

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

18. When your body temperature begins to rise, what happens?
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

19. Sugar Levels
Blood Pressure