1. Chapter 1
Bellringer # 6
A light microscope that has an objective lens of 10 x and an ocular lens of 20 x has a magnification of
30x
200x
300x
2000x
Open text to pg 279. Set up notes for chapter 14. Keep your preview page out.

2. Chapter 14 History of Life
Conceptual Strand 2: All life is interdependent and interacts with the environment.
2.6 Predict how a specific environmental change may lead to the extinction of a particular species.
2.7 Analyze factors responsible for the changes associated with biological succession.

3. Chapter 14 Table of Contents Section 1 Biogenesis
History of Life
Chapter 14
Table of Contents
Section 1 Biogenesis
Section 2 Earth’s History
Section 3 The First Life-Forms

4. Section 1 Biogenesis
Chapter 14
Objectives
Compare the principle of biogenesis with the idea of spontaneous generation.
Summarize the results of experiments by Redi and by Spallanzani that tested the hypothesis of spontaneous generation.
Describe how Pasteur’s experiment disproved the hypothesis of spontaneous generation.
Summarize the concept of half-life

5. Section 1 Biogenesis
Chapter 14
Redi’s Experiment
1600s: thought organisms could arise from nonliving material by spontaneous generation.

6. Redi’s Experiment, continued
Section 1 Biogenesis
Chapter 14
Redi’s Experiment, continued
1668: Redi showed rotting meat kept away from flies would not produce new flies.
Maggots appeared only on meat that had been exposed to flies.

7. Spallanzani’s Experiment
Section 1 Biogenesis
Chapter 14
Spallanzani’s Experiment
1700s: Spallanzani showed microorganisms would not grow in broth when its container was heated and then sealed.
He inferred that microorganisms do not arise spontaneously but, are carried in air.

8. Spallanzani’s Experiment
Section 1 Biogenesis
Chapter 14
Spallanzani’s Experiment

9. Section 1 Biogenesis
Chapter 14
Pasteur’s Experiment
1800s: Pasteur used a variation of Spallanzani’s design to prove that microorganisms are carried in air and do not arise by spontaneous generation.

10. Section 1 Biogenesis
Chapter 14
Pasteur’s Experiment

11. Isotopes: atoms with varying numbers of neutrons.
Section 2 Earth’s History
Chapter 14
Radiometric Dating
Isotopes: atoms with varying numbers of neutrons.

12. half-life: time that one-half of a sample takes to decay.
Section 2 Earth’s History
Chapter 14
The Formation of Earth, continued
Radiometric Dating
ages of rocks can be determined by measuring amount of radioactive decay that has occurred.
half-life: time that one-half of a sample takes to decay.

13. Section 2 Earth’s History
Chapter 14
Radioactive Decay

14. Chapter 14 Radiometric Dating Section 2 Earth’s History
Click below to watch the Visual Concept.
Visual Concept

15. Miller-Urey Experiment
Section 2 Earth’s History
Chapter 14
Miller-Urey Experiment

16. Spontaneous generation Radiometric dating Isotopes Mass number
14 Vocab
Biogenesis
Spontaneous generation
Radiometric dating
Isotopes
Mass number
6. Radioactive decay 7. half-life 8. Redi’s Experiment 9. Spallanzani’s Experiment 10. Pasteur’s Experiment