Ch 20: Holt McDougal Modern Biology Chapter 20: Community Ecology

About This Chapter

The Community Ecology chapter of this Holt McDougal Modern Biology textbook companion course helps students learn essential modern biology lessons on community ecology. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Community Ecology textbook chapter.

How it works:

  • Identify the lessons in the Holt McDougal Modern Biology Community Ecology chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the community ecology topics 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:

  • Competitive exclusion, interspecific competition and niche differentiation
  • Camouflage, warning coloration, mimicry and predator/prey interactions
  • Types of symbiotic relationships
  • Determining factors of species richness
  • Ecological succession

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

5 Lessons in Chapter 20: Holt McDougal Modern Biology Chapter 20: Community Ecology
Test your knowledge with a 30-question chapter practice test
Interspecific Competition, Competitive Exclusion & Niche Differentiation

1. Interspecific Competition, Competitive Exclusion & Niche Differentiation

What happens when two similar species that consume the same resources occupy the same space? Interspecific competition, that's what! Watch our video lesson to learn about the outcomes of this ecological battle.

Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration

2. Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration

You probably know that skunks can be quite stinky, bees sting and monarch butterflies are pretty, but do you know why? This lesson will introduce you to the reasons why some animals look or act the way they do and how these things relate to the predator/prey relationship.

Symbiotic Relationships: Mutualism, Commensalism & Parasitism

3. Symbiotic Relationships: Mutualism, Commensalism & Parasitism

If your cat or dog has ever had fleas, you've witnessed symbiosis in action. In this lesson, learn the many types of symbiosis in biology, and how these relationships can have a positive, negative, or neutral effect on the individual species.

Species Richness: Definition & Determining Factors

4. Species Richness: Definition & Determining Factors

In this lesson, you'll learn what species richness is and what factors can influence the index of species richness. You'll also discover why it is an important index to measure in terms of conservation.

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.

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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