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Ch 43: ORELA General Science: History of Life

About This Chapter

Sharpen your knowledge of the history of life with these fast and flexible video lessons. Each lesson covers a critical topic on Earth's history and origins that you could be asked about when you take the ORELA General Science exam.

ORELA General Science: History of Life - Chapter Summary

Review the history and origins of life on Earth before you register for the ORELA General Science exam. The videos in this chapter help you understand the following concepts:

  • Theories and explanations for life on Earth
  • Major eras in the history of the Earth
  • Evolution of cells and evolutionary change
  • Extinction and mass extinction
  • Evolutionary classifications

Our professional instructors break down larger concepts, like evolution, into small, bite-sized chunks that make it easy for you to retain the info you'll need for the exam. Learning new theories or reviewing concepts you've already studied is fun with the engaging animations and illustrations that are used throughout this chapter.

Objectives of the ORELA General Science: History of Life Chapter

Aspiring science teachers in Oregon need to pass the ORELA General Science exam before they can earn a license. A multiple-choice format is used to gauge your mastery of physical science, life science, Earth and space science and basic scientific principles. The life science domain asks about one quarter of the questions on the exam and is where you'll need to display your knowledge of the history of life. Before you take the exam, practice with our quizzes, which offer questions in the same format as those found on the exam.

6 Lessons in Chapter 43: ORELA General Science: History of Life
The Origin of Life on Earth: Theories and Explanations

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.

The History of Life on Earth: Timeline and Characteristics of Major Eras

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.

The Endosymbiosis Theory: Evolution of Cells

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.

Evolutionary Change: Definition and Forms

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.

What Is Extinction? - Defining Background and Mass Extinction

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.

Cladograms and Phylogenetic Trees: Evolution Classifications

6. Cladograms and Phylogenetic Trees: Evolution Classifications

Family trees help show how people are related to each other. Similarly, scientists use cladograms and phylogenetic trees to study the relationships between organisms.

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Other Chapters

Other chapters within the ORELA General Science: Practice & Study Guide course

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