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Ch 20: The Origin and History of Life On Earth

About This Chapter

Watch our video lessons and learn about the origin and history of life on earth. These lessons use easy-to-follow explanations and visuals to help you understand the origins of life on earth.

The Origin and History of Life On Earth - Chapter Summary and Learning Objectives

It's an age old question: Where did we come from? It brings about even more questions: How were human beings created? Was there such a thing as the Big Bang? How does religion play into the ideas of how life was created? There are many schools of thought on this topic. Throughout the scientific community, supernatural ideas are often dismissed, but those rooted in scientific proof are usually based upon life coming from non-living things. There are various theories as to how exactly this happened, which is what you'll be studying in this chapter. Our instructor will help you to understand the different pieces of evidence, the various ideas, and the main concepts connected with the question of how life began on earth. Some of the things you will learn about in these video lessons include:

  • How life evolved on earth
  • Theories on evolution
  • A timeline of life on earth
  • Characteristics of the major eras
  • The theory of the evolution of cells
  • Difference between prokaryotic and eukaryotic cells

Video Objective
The Origin of Life on Earth: Theories and Explanations Examine the various theories about how life started on earth.
The History of Life on Earth: Timeline and Characteristics of Major Eras Explore the different eras of life on earth to discover each period's characteristics.
The Endosymbiosis Theory: Evolution of Cells Analyze how cells evolved into living beings.
Evolutionary Change Discover the different ideas about how evolution occurs.

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