About This Chapter
Praxis Biology: Origin of Life on Earth - Chapter Summary
You can review the four basic stages widely accepted by scientists as to how non-living things could have turned into life. Meet A. I. Oparin, Harold Urey and Stanley Miller, and find out about their hypotheses and experiments.
You can also learn the theories of evolution, formed by both geologists and biologists, which portray wide patterns of change over many years. Examine the endosymbiotic theory, the panspermia hypothesis and the RNA world hypothesis. Get ready for the Praxis II Biology Content Knowledge exam by studying the following topics:
- Theories and explanations of the beginnings of life on Earth
- Key contributors to the study of evolution and the origins of life on Earth
- Main periods of change in Earth's history
- Effects of biological conditions on the composition of the atmosphere
- Evolutionary change
You can watch the video lessons, read the written transcripts and complete the short quizzes at the end of each lesson. The videos include tags that can help you quickly locate certain portions of the presentations for further review.
Praxis Biology: Origin of Life on Earth Objectives
Approximately 23 questions, or 15% of the entire exam, relate to the topics in this chapter. To prepare for this portion, you'll probably want to review the basics of evolution and different scientific accounts of how life on Earth may have begun, in addition to the various types of evidence that give strength to the theories and hypotheses. All of the test questions are multiple-choice. Our experienced teachers provide well-crafted quizzes at the end of each lesson, which can be a definite advantage towards your successful review for test day.
1. The Origin of Life on Earth: Theories and Explanations
Ever wonder how living things came from non-living things? We will explore what conditions on early Earth may have created life from non-living items.
2. The History of Life on Earth: Timeline and Characteristics of Major Eras
The Earth is over 4.6 billion years old. Ever wonder what happened during certain time periods in that large amount of time? We will look at the major eons and eras of Earth's history along with important characteristics of each.
3. The Endosymbiosis Theory: Evolution of Cells
Ever wonder why some cells are very simple and others are complex with countless organelles to remember? We will look at how simple cells evolved to become more complex cells - as well as evidence to support this.
4. Evolutionary Change: Definition and Forms
You've probably heard of Charles Darwin and evolution. We know that evolution is change over time, but here we will look at how these changes may have occurred during Earth's history.
5. The Causes of Species Extinction
What do dinosaurs, passenger pigeons, and a species of Australian rat all have in common? They have all gone extinct. This lesson will examine the causes of species extinction from mass extinctions in the past to human-caused extinctions today.
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Other chapters within the Praxis Biology (5235): Practice & Study Guide course
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- Praxis Biology: Science Principles - Hypotheses, Theories and Change
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- Praxis Biology: Science Principles - Interpretation and Models
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- Praxis Biology: Molecular Structure Basics
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- Praxis Biology: Cellular Division
- Praxis Biology: DNA and Replication
- Praxis Biology: RNA and Gene Expression
- Praxis Biology: Mutations and Other Genetic Changes
- Praxis Biology: Biology Lab Techniques
- Praxis Biology: DNA Technology
- Praxis Biology: Genetics and Inheritance
- Praxis Biology: Human Genetics
- Praxis Biology: Species, Populations and Evolution
- Praxis Biology: Classification of Organisms
- Praxis Biology: Human Anatomy and Physiology
- Praxis Biology: Immunology
- Praxis Biology: Animal Reproduction and Development
- Praxis Biology: Plant Biology
- Praxis Biology: Plant Reproduction & Growth
- Praxis Biology: Population Ecology
- Praxis Biology: Ecosystem Ecology
- Praxis Biology: Human Impacts on the Environment
- Praxis Biology: Environment and Society
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