About This Chapter
The Origins of Life on Earth - Chapter Summary
In this chapter, you learn about possible explanations for how living organisms developed on Earth. Our instructors also delve into how life evolved over time and the eventual extinction of species. The lessons in this chapter cover the following topics:
- Examining theories and explanations for the origin of life on Earth
- Discussing the timeline and characteristics of the major eras
- Defining the Endosymbiosis Theory
- Looking at forms of evolutionary change
- Discussing extinction, including mass extinction
Our video lessons, taught by subject-matter experts, simplify learning by breaking down complicated concepts into easier to grasp components. Videos include links to text lessons detailing key terms and video transcripts provide you with an additional study aid. When you're ready, take lesson quizzes to test your mastery of the materials taught by our instructors.
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. What Is Extinction? - Defining Background and Mass Extinction
In this lesson you'll discover what the term 'extinction' means as well as learn the two different types of extinction: mass extinction and background extinction. You will also discover how humans contribute to extinction events.
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Other chapters within the GACE Biology: Practice & Study Guide course
- Atomic and Molecular Structure
- Overview of Chemical Bonds and Reactions
- Types of Organic Molecules
- How Enzymes Work
- Basics of Metabolic Biochemistry
- Cell Biology
- Overview of Cell Division
- Process of DNA Replication
- The Transcription and Translation Process
- Basics of Gene Mutations
- Basic Molecular Biology Laboratory Techniques
- Biology of Genetics
- Mechanisms of Biological Evolution
- Processes of Scientific Inquiry and Experimental Design
- Processes of Scientific Data Collection and Manipulation
- The Multidisciplinary Nature of Biology
- Important Figures and Events in Biology
- Lab Safety Procedures and Hazards
- Using Laboratory Equipment
- Science, Technology and the Environment
- Organism Classification & Phylogenesis
- Requirements of Biological Systems
- Physiology I: The Circulatory, Respiratory, Digestive, Excretory, and Musculoskeletal Systems
- Physiology II: The Nervous, Immune, and Endocrine Systems
- Animal Reproduction and Development
- Male Reproductive System
- Female Reproductive System
- Plant Biology
- Plant Reproduction and Growth
- Populations and Biological Communities
- Overview of Animal Behavior
- Ecosystems and Biomes
- Biochemical Cycles
- Human Activity and the Biosphere