1. Classifying Life on Earth
Fossils Song

2. Fossils Read page 194 What is the most common way that fossils form?
An organism dies and becomes buried in the sediment. The organism gradually decomposes and leaves a hollow impression, or mold, in the sediment. Over time, the mold fills with sediment, which forms a cast of the organism.

3. Fossils
What is a scientist called who use fossils to reconstruct the history of life before humans existed?
A paleontologist

4. How old was that? Read page 194.
What is the difference between relative and absolute dating?
Relative dating is using its position in the soil to determine its age, but absolute dating uses atoms and carbon to get a more precise date.
Absolute dating is more accurate

6. Geological Time Scale Read p.196
What is the purpose of the geological time scale?
To outline the history of life on Earth.
How are the divisions divided?
By what type of organisms dominated earth at the time

7. What happened? Read p.197 What is a mass extinction?
A period where large number of species disappeared from the fossil record.
Mass Extinction

8. But where is Waldo? Read p.198-199
What was Pangaea and who purposed it?
It was the idea that all of the Earth’s land was linked together and surrounded by a giant ocean. It was purposed by Alfred Wegener.
Pangaea

9. Let’s remember You are to read pages 200-205
You are to make a chart like this
ERA
Major Events
Precambrian time
Paleozoic Era
Mesozoic Era
Cenozoic Era

10. Still remembering ERA SIGNIFICANT EVENT Precambrian Time
Beginning of life, multicellular organisms first appear
Paleozoic Time
First air breathing animals, plants developed, 90% of Paleozoic Era species died at the end
Mesozoic Era
Age of the Reptiles, large forest developed, extinction of the dinosaurs happened
Cenozoic Era
Age of mammals, ice ages occurred, humans took over the earth

11. What can we ask to classify better
Read p. 222
What are the three questions that classifying organisms can help answer?
How many species are there?
What are the defining characteristics of each species?
What are the relationships between these species?

12. More classifying Read p.223
What is the science of describing, classifying, and naming living things?
Taxonomy, founded by Carolus Linnaeus
What did he classify living things based on?
Shape and structure
Taxonomy -- Crash Course

13. 7 Levels of Classification
Read p.224
What is the 7 levels of classification?
Kingdom, Phylum, Class, Order, Family, Genus, Species
What two levels of classification are used to name animals?
Genus and species.

14. What is a dichotomous key?
Read p.226 through 227
What is a dichotomous key?
An aid that is used to identify organisms and that consists of the answers to a series of questions.
Can we add classify any more organisms?
YES, YES, YES.

15. Using a dichotomous key.
Lets make some keys ourselves.

16. Classifying Read p. 228 How do we classify organisms?
By their characteristics

17. Classifying Read p. 229 What are two kingdoms of bacteria?
Archaebacteria which live in extreme environments
Eubacteria which has most of the rest bacteria

18. Characteristics of the rest
Read p
What are protista?
Commonly known as protists. Mostly one celled. Differed from all other kingdoms. Have a nucleus and membrane-bound organelles.

19. Characteristics of the rest
What is a Fungi?
They absorb nutrients from their surroundings. No means of movement. Reproduce by using spores. Molds and mushrooms are examples of these.

20. Characteristics of the rest.
Read p.231
What is a plantae?
Complex, multi-cellular organisms that are usually green, have cell walls, cannot move around, and use photosynthesis to make energy.

21. Characteristics of the rest
Read p
What is Animalia?
Complex, multicellular organisms that do not have cell walls, can usually move around, and can quickly respond to their environment. They also depend on bacteria and fungi to recycle nutrients found in the ground.