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Ch 25: Holt McDougal Biology Chapter 25: Vertebrate Diversity

About This Chapter

The Vertebrate Diversity chapter of this Holt McDougal Biology Companion Course helps students learn the essential lessons associated with vertebrate diversity. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Vertebrate Diversity textbook chapter.

How It Works:

  • Identify the lessons in the Holt McDougal Vertebrate Diversity chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the topics on traits of vertebrates 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:

  • Where vertebrates came from
  • Classes of jawless craniates
  • The development of jaws in vertebrate fish
  • Characteristics of bony fish
  • Tetrapods and their development of limbs
  • The function and characteristics of amphibians
  • Types of vertebrates that live on land

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8 Lessons in Chapter 25: Holt McDougal Biology Chapter 25: Vertebrate Diversity
Test your knowledge with a 30-question chapter practice test
Vertebrates: Origin, Characteristics & Diversity

1. 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.

Jawless Craniates: Class Myxini & Class Petromyzontida

2. Jawless Craniates: Class Myxini & Class Petromyzontida

Jawless craniates are chordates that have heads but no jaws. Learn about the jawless crainates, the class myxini which include the hagfishes, and the class petromyzontida which include the Lampreys.

Gills: Definition & Anatomy

3. Gills: Definition & Anatomy

Gills are specialized organs that allow aquatic organisms to obtain oxygen from the water. Learn the definition and anatomy of gills; discover their types, shapes, and sizes; and read about the animals that have them.

Fishes and Sharks: Origins of Jaws in Vertebrates

4. Fishes and Sharks: Origins of Jaws in Vertebrates

The structure of the hinged jaw evolved in animals like fish and sharks. Learn about the origins of the hinged jaw, discover the creatures of the chondrichthye class, and then explore ray-finned and lobe-finned fishes.

Bony Fish: Characteristics, Anatomy & Types

5. Bony Fish: Characteristics, Anatomy & Types

Bony fish are called Osteichthyes, or fish that have bony skeletons. Explore the characteristics, physiology, anatomy, and different types of bony fish and review some examples of them.

Tetrapods: Development of Limbs in Vertebrates

6. Tetrapods: Development of Limbs in Vertebrates

Tetrapods are four-limbed vertebrates hypothesized in the scientific community to have evolved from lobe-finned fish. Learn about amniotic eggs, tetrapods, and the development of limbs in vertebrates like tetrapods.

Amphibians: Traits, Types & Roles

7. Amphibians: Traits, Types & Roles

Amphibians are cold-blooded vertebrates that have moist skin without scales and can live in both terrestrial and aquatic ecosystems. Learn more about amphibians, and explore their traits, types, and roles.

Land Vertebrates: Reptiles, Birds & Mammals

8. Land Vertebrates: Reptiles, Birds & Mammals

Things changed a lot when vertebrates left the water and moved to land. This lesson will compare reptiles, birds, and mammals to one another and explain why they look the way they do.

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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