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Ch 5: Holt McDougal Environmental Science Chapter 5: How Ecosystems Work

About This Chapter

The How Ecosystems Work chapter of this Holt McDougal Environmental Science Companion Course helps students learn the essential lessons associated with how ecosystems work. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the How Ecosystems Work textbook chapter.

How It Works:

  • Identify the lessons in the Holt McDougal How Ecosystems Work chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the topics on how ecosystems work that you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • To explain how energy flows through an ecosystem
  • The phosphorus, nitrogen, carbon and other biogeochemical cycles
  • To understand and explain the processes at work in ecological succession

Holt McDougal is a registered trademark of Houghton Mifflin Harcourt, which is not affiliated with Study.com.

6 Lessons in Chapter 5: Holt McDougal Environmental Science Chapter 5: How Ecosystems Work
Test your knowledge with a 30-question chapter practice test
Food Chains, Trophic Levels and Energy Flow in an Ecosystem

1. Food Chains, Trophic Levels and Energy Flow in an Ecosystem

In this lesson, you'll learn about food chains, food webs, and the different roles that organisms play in an ecosystem. You'll also learn about how energy flows through an ecosystem.

Biogeochemical Cycling and the Phosphorus Cycle

2. Biogeochemical Cycling and the Phosphorus Cycle

In this video lesson, we'll take a look at how elements large and small use other elements to grow. This is achieved through cycles. We'll look at macronutrients, trace elements and the biogeochemical and phosphorous cycles.

The Nitrogen Cycle, Acid Rain and Fossil Fuels

3. The Nitrogen Cycle, Acid Rain and Fossil Fuels

Do you know the difference between nitrite and nitrate? Do you have any clue how all the nitrogen in the atmosphere becomes usable? If you can't answer these questions, then you need to watch this lesson on the nitrogen cycle.

The Carbon Cycle and Long-Term Carbon Storage

4. The Carbon Cycle and Long-Term Carbon Storage

All living organisms have a role in the carbon cycle. Do you know you understand how humans, animals and plants use carbon? This lesson will introduce you to the carbon cycle and explain how it functions on a global scale.

Ecological Succession: From Pioneer to Climax Communities

5. Ecological Succession: From Pioneer to Climax Communities

Just as people grow and change so, too, do ecosystems. Watch this lesson to learn about ecological succession from the beginning stages of development to a community's ultimate destination, or climax.

Succession in Freshwater and Terrestrial Ecosystems

6. Succession in Freshwater and Terrestrial Ecosystems

The world's many freshwater and terrestrial ecosystems are constantly changing. This lesson will discuss how these ecosystems change over time and how they recover after disturbances occur.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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