Ch 26: Prentice Hall Biology Chapter 26: Sponges and Cnidarians
About This Chapter
How it works:
- Identify the lessons in Prentice Hall Biology's Sponges and Cnidarians chapter with which you need help.
- Find the corresponding video lessons within this companion course chapter.
- Watch fun videos that cover the sponges and cnidarians 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:
- The evolutionary history of animals and why it's important to know
- The definition and characteristics of sponges
- The definition and characteristics of cnidarians
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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.

2. Parazoa: Definition and Characteristics
Parazoans are sponges of various sizes, shapes, and colors that lack specialized tissue and are classified as animals. Learn about the definition, characteristics, and overall composition of parazoa.

3. Radiata: Definition and Characteristics
Radiata is a group of invertebrates that includes animals like jellyfish, corals, and sea anemones. Learn the definition of radiata, explore their characteristics, and discover the differences between examples like Ctenophora and Cnidarians.
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Other Chapters
Other chapters within the Prentice Hall Biology: Online Textbook Help course
- Prentice Hall Biology Chapter 1: The Science of Biology
- Prentice Hall Biology Chapter 2: The Chemistry of Life
- Prentice Hall Biology Chapter 3: The Biosphere
- Prentice Hall Biology Chapter 4: Ecosystems and Communities
- Prentice Hall Biology Chapter 5: Populations
- Prentice Hall Biology Chapter 6: Humans in the Biosphere
- Prentice Hall Biology Chapter 7: Cell Structure and Function
- Prentice Hall Biology Chapter 8: Photosynthesis
- Prentice Hall Biology Chapter 9: Cellular Respiration
- Prentice Hall Biology Chapter 10: Cell Growth and Division
- Prentice Hall Biology Chapter 11: Introduction to Genetics
- Prentice Hall Biology Chapter 12: DNA and RNA
- Prentice Hall Biology Chapter 13: Genetic Engineering
- Prentice Hall Biology Chapter 14: The Human Genome
- Prentice Hall Biology Chapter 15: Darwin's Theory of Evolution
- Prentice Hall Biology Chapter 16: Evolution of Populations
- Prentice Hall Biology Chapter 17: The History of Life
- Prentice Hall Biology Chapter 18: Classification
- Prentice Hall Biology Chapter 19: Bacteria and Viruses
- Prentice Hall Biology Chapter 20: Protists
- Prentice Hall Biology Chapter 21: Fungi
- Prentice Hall Biology Chapter 22: Plant Diversity
- Prentice Hall Biology Chapter 23: Roots, Stems, and Leaves
- Prentice Hall Biology Chapter 24: Reproduction of Seed Plants
- Prentice Hall Biology Chapter 25: Plant Responses and Adaptations
- Prentice Hall Biology Chapter 27: Worms and Mollusks
- Prentice Hall Biology Chapter 28: Arthropods and Echinoderms
- Prentice Hall Biology Chapter 29: Comparing Invertebrates
- Prentice Hall Biology Chapter 30: Nonvertebrate Chordates, Fishes, and Amphibians
- Prentice Hall Biology Chapter 31: Reptiles and Birds
- Prentice Hall Biology Chapter 32: Mammals
- Prentice Hall Biology Chapter 33: Comparing Chordates
- Prentice Hall Biology Chapter 34: Animal Behavior
- Prentice Hall Biology Chapter 35: Nervous System
- Prentice Hall Biology Chapter 36: Skeletal, Muscular, and Integumentary Systems
- Prentice Hall Biology Chapter 37: Circulatory and Respiratory Systems
- Prentice Hall Biology Chapter 38: Digestive and Excretory Systems
- Prentice Hall Biology Chapter 39: Endocrine and Reproductive Systems
- Prentice Hall Biology Chapter 40: The Immune System and Disease