1. The History of Life on Earth
CHAPTER
NEW CHAPTER
The History of Life on Earth
the BIG idea
1.1
1.2
1.3
Living things, like Earth itself, change over time.
Earth has been home to living things for about 3.8 billion years.
Species change over time.
Many types of evidence support evolution.
CHAPTER OUTLINE

2. Earth has been home to living things for about 3.8 billion years.
1.1
Earth has been home to living things for about 3.8 billion years.
Fossil records inform humans about the development of life on Earth.
Information from fossils can help scientists reconstruct Earth's history.
fossil
unicellular organism
multicellular organism
mass extinction
250 million years ago
70 million years ago
55 million years ago
SECTION
OUTLINE

3. Species change over time.
1.2
Species change over time.
Darwin's theory of natural selection explains evolution.
evolution
Four principals of natural selection are
natural selection
• overproduction
Overproduction
adult salmon
eggs
adaptation
speciation
SECTION
OUTLINE

4. Species change over time.
1.2
Species change over time.
Darwin's theory of natural selection explains evolution.
evolution
Four principals of natural selection are
natural selection
• overproduction
adaptation
• variation
Variation
curve
speciation
SECTION
OUTLINE

5. Species change over time.
1.2
Species change over time.
Darwin's theory of natural selection explains evolution.
evolution
Four principals of natural selection are
natural selection
• overproduction
adaptation
Adaptation
• variation
speciation
• adaptation
SECTION
OUTLINE

6. Species change over time.
1.2
Species change over time.
Darwin's theory of natural selection explains evolution.
evolution
Four principals of natural selection are
natural selection
• overproduction
adaptation
Selection
• variation
speciation
• adaptation
• selection
SECTION
OUTLINE

7. Many types of evidence support evolution.
1.3
Many types of evidence support evolution.
Three different types of evidence provide a bigger picture of evolution
ancestor
vestigial organ
fossil
genetic
gene
biological
SECTION
OUTLINE

8. 1.1 Earth has been home to living things for about 3.8 billion years.
I. Earth has been home to living things for about 3.8 billion years.
fossil
A. Fossils provide evidence of earlier life.
unicellular organism
1. Types of Fossils
multicellular organism
2. Finding the Age of Fossils
3. Assembling the Fossil Record
mass extinction
B. More complex organisms developed over time.
1. Unicellular Organisms
2. Multicellular Organisms
3. Life on Land
C. Earth’s history includes mass extinctions.
1. Permian Extinction
2. Cretaceous Extinction
KEY CONCEPT
SUMMARY

9. 1.2 Species change over time. II. Species change over time.
evolution
A. Scientists explore the concept of evolution.
natural selection
1. Early Ideas
adaptation
2. Darwin’s Observations
speciation
B. Natural selection explains how living things evolve.
1. Overproduction
2. Variation
3. Adaptation
4. Selection
5. Isolation
KEY CONCEPT
SUMMARY

10. 1.2 Species change over time. II. Species change over time.
evolution
C. New species develop from earlier species.
natural selection
1. Speciation
adaptation
2. Isolation
speciation
KEY CONCEPT
SUMMARY

11. 1.3 Many types of evidence support evolution.
III. Many types of evidence support evolution.
ancestor
A. Observations provide evidence for theories.
vestigial organ
B. Fossil evidence supports evolution.
gene
C. Biological evidence supports evolution.
1. Similarities in Structure
2. Similarities in Development
D. Genetic evidence supports evolution.
KEY CONCEPT
SUMMARY