Ch 32: Holt McDougal Modern Biology Chapter 32: Introduction to Animals

About This Chapter

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

How it works:

  • Identify the lessons in the Holt McDougal Modern Biology Introduction to Animals chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the animal 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:

  • Evolutionary history of animals
  • Animal body plans
  • Characteristics and origin of vertebrates
  • Definition and types of invertebrates
  • Animal reproduction and development
  • Characteristics of protosomes

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

6 Lessons in Chapter 32: Holt McDougal Modern Biology Chapter 32: Introduction to Animals
Test your knowledge with a 30-question chapter practice test
The Evolution of Animals: Importance & Evolutionary History

1. The Evolution of Animals: Importance & Evolutionary History

Animals, including humans, consists of multi-cellular organisms that have undergone an evolution from early life forms. Learn about the characteristics of organisms, their body structures, and the importance of understanding the evolutionary history and characteristics of animals.

Animal Body Plans: Classifications and Features

2. Animal Body Plans: Classifications and Features

The body plans of animals have different classifications and features that are affected by various factors. Learn about body plans, the types of body symmetry, body cavities and tissues, and locations of body structures.

Vertebrates: Origin, Characteristics & Diversity

3. Vertebrates: Origin, Characteristics & Diversity

Vertebrates refer to all species of animals that have backbones. Explore the origin and evolution of vertebrates, learn about the non-vertebrate chordates and jawed vertebrates, and find out how the vertebrates tetrapods and amniotes first transitioned to land.

Invertebrates: Definition & Examples

4. Invertebrates: Definition & Examples

Invertebrates are animals that have no vertebral column or backbone. Explore the definition and types of invertebrates, and explore common examples of invertebrates that are encountered in our daily life.

Overview of Animal Reproduction and Development

5. Overview of Animal Reproduction and Development

Sexual reproduction in animals involves many different steps, beginning with gametogenesis and ending with the formation of three primary germ layers. Discover how those initial steps happen, and explore different definitions of the parts of animal reproduction and development.

Protostomes: Definition and Characteristics

6. Protostomes: Definition and Characteristics

Protostomes are a diverse group of organisms characterized by similar internal body plans that include an enormous number of animals. Explore more about the definition of protostomes, their evolution, and characteristics, learn how to differentiate between protostomes and deuterostomes, and discover several examples of protostsomes.

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
More Exams
There are even more practice exams available in Holt McDougal Modern Biology Chapter 32: Introduction to Animals.

Earning College Credit

Did you know… We have over 220 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Other Chapters

Other chapters within the Holt McDougal Modern Biology: Online Textbook Help course