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Ch 21: Evolutionary Change

About This Chapter

This chapter can deepen your understanding of evolutionary change and improve your ability to excel on an exam covering this subject area. Review engaging lessons presented by expert instructors and take multiple-choice quizzes to get the knowledge boost you need.

Evolutionary Change - Chapter Summary

Enjoy exclusive access to entertaining online lessons that provide an in-depth analysis of evolutionary change. Developed by top instructors, this chapter delves into topics that include natural selection, reproductive isolation and divergent evolution. Reviewing the lessons will enable you to:

  • Define evolutionary change
  • Discuss the works and voyages of Charles Darwin and his theory of natural selection
  • List the observations Darwin made that led to his theory of natural selection
  • Explain punctuated equilibrium in evolution
  • Differentiate between convergent and divergent evolution
  • Share details about science evidence that supports evolution
  • Describe how fossils provide evidence for biological diversity, speciation and mass extinction
  • Identify and discuss ways changes to the environment can impact evolution

If you're concerned that your busy schedule will get in the way of your ability to study the lessons in this chapter, don't worry! All lessons and other resources are available around-the-clock from any location with an Internet connection. Jump on your computer, smartphone or tablet and begin studying evolutionary change today. When ready, gauge your comprehension by taking mini quizzes and a chapter exam.

10 Lessons in Chapter 21: Evolutionary Change
Test your knowledge with a 30-question chapter practice test
Evolutionary Change: Definition and Forms

1. 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.

Charles Darwin: Voyages, Theories & Works

2. Charles Darwin: Voyages, Theories & Works

In this lesson we explore the life and voyages of the 19th-century British naturalist Charles Darwin and his formulation of the theory of natural selection.

Natural Selection & Adaptation: Definition, Theory & Examples

3. Natural Selection & Adaptation: Definition, Theory & Examples

How does natural selection help shape the amazing types of animals we witness around us? In this lesson, we'll explore adaptations and what they can tell us about a species' past evolution.

How Darwin's Observations Showed the Process of Natural Selection

4. How Darwin's Observations Showed the Process of Natural Selection

In this lesson, we will learn about the observations that led to the development of Darwin's theory of natural selection. We'll explore how natural selection happens and how this brings about genetic diversity.

Rates of Evolution: Punctuated Equilibrium & Molecular Clock Hypothesis

5. Rates of Evolution: Punctuated Equilibrium & Molecular Clock Hypothesis

In general, evolution is a very long process. But rates of evolution can be different for different organisms. In this video lesson, you will identify how scientists study rates of evolution and fill in some of the missing 'steps' in the fossil record.

Reproductive Isolation: Definition, Types & Examples

6. Reproductive Isolation: Definition, Types & Examples

Typically, animals can only mate within their own species. In this lesson, you will learn about reproductive isolation, or when two species are unable to reproduce, including types and examples of isolation.

Divergent & Convergent Evolution: Definitions & Examples

7. Divergent & Convergent Evolution: Definitions & Examples

Two types of macroevolution are essential to the understanding of evolutionary theory. Explore this lesson and learn more about convergent evolution and divergent evolution.

Scientific Evidence That Supports Evolution

8. Scientific Evidence That Supports Evolution

Evolution explains how species that are present on Earth today are modified descendants of their ancestors. This scientific theory is supported by many different types of evidence, which show how evolution is a very real and natural phenomenon.

Fossil Evidence for Biological Diversity, Speciation, & Mass Extinction

9. Fossil Evidence for Biological Diversity, Speciation, & Mass Extinction

One of the best sources of evidence we have for evolution is the fossil record. Fossils provide a wealth of information on how species change over time and for exciting events like mass extinctions and new species formation.

How Environmental Changes Impact Evolution

10. How Environmental Changes Impact Evolution

The process of evolution is pushed forward by an organism's need to adapt to changing situations. This lesson will help you understand how environmental changes can provide this push.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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