1. What is life?

2. The characteristics of living things
Six characteristics that all living things share
Have cellular organization
Contain similar chemicals
Use energy
Respond to their surroundings
Grow and develop
Reproduce

3. Cellular Organization
The cell is the basic unit of all living things
Unicellular = one cell
Multicellular = more than one cell

4. The chemicals of life
The cells of all living things are composed of chemicals
Water is the most abundant chemical
Carbohydrates
Lipids
Proteins
Nucleic acids

5. Energy Use Cells need energy to work We get energy by eating food.
We are consumers or heterotrophs
How do plants get energy? Fungi?

6. Response to Surroundings
Stimulus
Change in surroundings
Response
Action or change in behavior

7. Growth and Development
Growth is the process of becoming larger
Development is becoming more complex

8. Life comes from Life
Living things come from living things through reproduction
Spontaneous generation
Mistaken idea that living things can come from non living sources
Francesco Redi showed that flies do not come from decaying meat
Louis Pasteur used a controlled experiment to show that bacteria do not arise from boiled broth

9. What did Redi change?
This is called the Independent variable

10. What was the Independent variable in Pasteur’s experiment?

11. The needs of living things
Water-cannot survive long without
Needed in order to
Obtain chemicals from surroundings
Break down food
Grow
Move substances within bodies
Reproduce
Food-for energy
Autotrophs make their own food
Heterotrophs cannot make their own food
Living Space
Stable internal conditions-Homeostasis
Needed for cells to function
What happens when you get too hot?