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Ch 26: Introduction to Invertebrates: Help and Review

About This Chapter

The Introduction to Invertebrates chapter of this High School Biology Help and Review course is the simplest way to master the study of invertebrates. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of invertebrates.

Who's it for?

Anyone who needs help learning or mastering high school biology material will benefit from taking this course. There is no faster or easier way to learn biology. Among those who would benefit are:

  • Students who have fallen behind in understanding animal body plans and invertebrates
  • Students who struggle with learning disabilities or learning differences, including autism and ADHD
  • Students who prefer multiple ways of learning science (visual or auditory)
  • Students who have missed class time and need to catch up
  • Students who need an efficient way to learn about invertebrates
  • Students who struggle to understand their teachers
  • Students who attend schools without extra science learning resources

How it works:

  • Find videos in our course that cover what you need to learn or review.
  • Press play and watch the video lesson.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Verify you're ready by completing the invertebrates chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the invertebrates chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any invertebrate question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

This chapter helps students review the concepts in an invertebrates unit of a standard high school biology course. Topics covered include:

  • Characteristics and classification of animal body plans
  • Deuterostomes
  • Parazoa
  • Protostomes
  • Radiata

37 Lessons in Chapter 26: Introduction to Invertebrates: Help and Review
Animal Body Plans: Classifications and Features

1. Animal Body Plans: Classifications and Features

The Animal Kingdom is diverse and complex. How do we make sense of it all? Scientists use body plans to classify and organize the animals of Earth, making it much easier to differentiate between them.

Parazoa: Definition and Characteristics

2. Parazoa: Definition and Characteristics

The sub-kingdom Parazoa is a special group of animals that are unlike any other. In this video lesson, you'll learn about the characteristics of Parazoans and identify what makes them a unique section of the Animal Kingdom.

Radiata: Definition and Characteristics

3. Radiata: Definition and Characteristics

The super-phylum Radiata describes a unique and interesting group of animals. In this video lesson you'll identify various animals that belong in this classification as well as describe the characteristics that make them so identifiable.

Protostomes: Definition and Characteristics

4. Protostomes: Definition and Characteristics

Though you may not be able to tell just by looking at them, protostomes are an evolutionarily related group based on shared characteristics of their body plans. In this lesson, you will identify these characteristics, as well as see examples of the variety of animals this group encompasses.

Deuterostomes: Definition and Characteristics

5. Deuterostomes: Definition and Characteristics

Deuterostomes, like tunicates and urchins, are amazing creatures that are classified together because they share aspects of their evolutionary pasts. In this lesson, you'll identify these characteristics and see what makes this group of animals unique.

Cnidarians: Types & Examples

6. Cnidarians: Types & Examples

Corals and jellyfish belong to a group of invertebrate animals called Cnidarians. In this lesson, you will learn about the classification and biology of these fascinating organisms and their relatives, including one of the most lethal creatures known to mankind: the Australian box jellyfish.

Ascaris Parasitic Worms: Phylum & Classification

7. Ascaris Parasitic Worms: Phylum & Classification

In this lesson we will explore the parasitic worms of the genus Ascaris, which are part of the phylum Nematoda. We will also see what relation they have with humans.

Ascaris Worms: Anatomy & Digestive Systems

8. Ascaris Worms: Anatomy & Digestive Systems

In this lesson, we will learn briefly learn about the characteristics of a common roundworm ''Ascaris''. Then we will discuss the anatomy of ''Ascaris'' including the senses, skin, muscles, body cavity, and digestive system.

Ascaris Worms: Larvae & Reproduction

9. Ascaris Worms: Larvae & Reproduction

In this lesson we explore the wild ride of Ascaris worm growth and maturation. We'll look at the reproduction cycle that leads them on a journey through their host's body as well as the outside world.

Ascaris Worms: Life Cycle & Pictures

10. Ascaris Worms: Life Cycle & Pictures

Ascaris worms are intestinal parasites that can infect the human intestinal tracts, resulting in an infection called ascariasis. Read this lesson to learn about these worms and how humans become infected.

Comparing Male & Female Ascaris Worms

11. Comparing Male & Female Ascaris Worms

In this lesson, we'll learn about the external and internal biological differences between male and female Ascaris worms. This information will help us determine the sex of an Ascaris worm when asked to dissect one in a zoology, biology, or general science course.

Metamerism in Annelids

12. Metamerism in Annelids

Metamerism refers to a body type in which there are repeating segments that are connected to make a whole. It is exhibited in annelids such as earthworms. Learn more here and quiz yourself.

Paramecium: Definition, Characteristics & Parts

13. Paramecium: Definition, Characteristics & Parts

Have you ever heard of a paramecium? Do you know what a paramecium looks like or where it lives? In this lesson you will learn about this organism as well as some of its important characteristics.

Phylum Annelida Circulatory & Nervous Systems

14. Phylum Annelida Circulatory & Nervous Systems

In this lesson, we'll learn about the structure and function of the circulatory and nervous systems in the group, or phylum, that includes earthworms - Phylum Annelida. Annelids have simple, but interesting ways of pumping blood through their bodies, and also in sensing their surrounding environment.

Phylum Annelida Digestive & Respiratory Systems

15. Phylum Annelida Digestive & Respiratory Systems

Animals of the world are broken down by similar characteristics. One of the first levels after kingdom, is phylum. The Phylum Annelida covers the worms, such as earthworms. What makes them special? We look at their digestive and respiratory abilities here.

Phylum Annelida: Characteristics, Classes & Examples

16. Phylum Annelida: Characteristics, Classes & Examples

Phylum Annelida contains a variety of worms and their relatives. They are found everywhere from marine and freshwater habitats to damp soil. Learn more about annelids here and take a short quiz.

Phylum Porifera Reproduction

17. Phylum Porifera Reproduction

In this lesson, we will explore the various ways that Porifera are able to reproduce. This includes sexual and asexual methods, both of which help facilitate the survival of the many different species.

Phylum Porifera: Definition, Characteristics & Examples

18. Phylum Porifera: Definition, Characteristics & Examples

In this lesson, we will explore the phylum Porifera and look at the organisms that make up the group. We will discuss their key features, body structure, their filtration mechanism, and why they are so important to the oceans.

Porifera Digestive System & Excretion

19. Porifera Digestive System & Excretion

This lesson is on the digestive and excretory systems of porifera. In this lesson, we'll go over what a poriferan is and the basic cells needed to digest food and excrete waste.

The Porifera Life Cycle

20. The Porifera Life Cycle

Have you ever seen a sea sponge before? Do you know how they reproduce? In his lesson you will learn all about Porifera, how they reproduce, and the processes they go through to complete their life cycle.

Porifera Respiration & Respiratory System

21. Porifera Respiration & Respiratory System

Learn about the aquatic sponges that comprise the phylum Porifera, and examine the interesting and unusual way in which their respiratory system functions.

Porifera: Body Plan, Symmetry & Skeleton

22. Porifera: Body Plan, Symmetry & Skeleton

In this lesson we'll explore the varied types of body plans that porifera utilize and take a look at some of their more universal features, such as their body symmetry and their 'skeletal' support structure.

Porifera: Species & Types

23. Porifera: Species & Types

This lesson is on poriferans, stationary animals of the sea from the phylum Porifera. In this lesson, we'll go over the three types of poriferans and look at an example of each type, then you can test your knowledge with a short quiz.

Protozoa: Types & Reproduction

24. Protozoa: Types & Reproduction

Have you ever heard of a protozoa? In this lesson, you will learn some interesting facts about protozoa. You will learn how they move and eat, and importantly, how they reproduce.

Reproduction of Planaria Worms

25. Reproduction of Planaria Worms

In this lesson, we'll discuss the reproductive cycle and regeneration ability of planarian worms. We'll also discuss medical and scientific implications of planarian regrowth.

Tapeworms in Humans: Symptoms & Treatment

26. Tapeworms in Humans: Symptoms & Treatment

Have you ever heard of a tapeworm? In this lesson, you will learn about tapeworms and how they can infect humans. You will also learn how a tapeworm infection is treated and how it can be prevented.

The Dumbo Octopus: Facts & Anatomy

27. The Dumbo Octopus: Facts & Anatomy

Have you ever heard of the Dumbo Octopus? In this lesson you will learn all about this fascinating creature, where it lives, and how it survives in its habitat.

The Mimic, Blue Ring & Blanket Octopuses

28. The Mimic, Blue Ring & Blanket Octopuses

The cephalopods (octopuses) are a diverse group of aquatic organisms. They have unique and effective defense mechanisms and forms of hunting. Read this lesson to learn about three of these octopus groups!

What are Roundworms? - Types, Examples & Characteristics

29. What are Roundworms? - Types, Examples & Characteristics

Have you ever heard of roundworm? Do you know anything about this kind of parasite? In this lesson, you will learn about the different types of roundworms and some of the characteristics they share.

Pentaradial Symmetry: Definition & Types

30. Pentaradial Symmetry: Definition & Types

Among invertebrate animals, only the echinoderms have this kind of radial symmetry. In this lesson, we'll define pentaradial symmetry and explore a few different types we see in nature.

Chordata Digestive System

31. Chordata Digestive System

Members of the Phylum Chordata are among the most advanced in the animal kingdom - these include fish, amphibians, reptiles, birds, and mammals. Read this lesson to learn about similarities and differences among the digestive systems found in this phylum.

Chordata Excretory System

32. Chordata Excretory System

Chordates produce waste products through metabolic processes, and these wastes are removed from the body with the excretory system. In this lesson we'll discuss the types of wastes produced and just how these animals deal with them.

Chordata Nervous System

33. Chordata Nervous System

Chordates make up most of the critters you consider animals. This lesson will explain what nervous system characteristics this phylum shares and then will look at the sub-phyla within this group.

Examples of Invertebrate Chordates

34. Examples of Invertebrate Chordates

What is an invertebrate chordate? In this lesson, we'll discuss what's so different about this unique group of animals and their specialized traits, and take a look at some examples from different groups of chordates.

Bivalve: Anatomy & Reproduction

35. Bivalve: Anatomy & Reproduction

Bivalves are aquatic animals much lower on the evolutionary scale from humans, but a definite link exists along the way to our complex selves. Bivalve anatomy as well as their reproductive behavior provide a link between more simplistic animals and more complex, like humans. We will explore a little about bivalves here.

What is Cephalization? - Definition & Advantage

36. What is Cephalization? - Definition & Advantage

You probably realize that most animals have heads. But some, including starfish, don't. Why is having a head so important to some animals and not to others? This lesson discusses cephalization and why it's so important.

Echinoderm Structure: Skeleton & Symmetry

37. Echinoderm Structure: Skeleton & Symmetry

The weird and wonderful animals of the Phylum Echinodermata have a calcium carbonate skeleton and a kind of symmetry that is fivefold. They are unique in the animal kingdom in having this symmetry. In this lesson we'll delve into the skeleton and symmetry of the Echinodermata.

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Other Chapters

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