Lesson 1 – Animals without a Backbone Vocabulary words: invertebrate- an animal without a backbone

Lesson 1 – Animals without a Backbone Vocabulary words: sponge- a simple invertebrate that has a hollow body with a single opening and lives in water

Lesson 1 – Animals without a Backbone Vocabulary words: cnidarian- an invertebrate with stinging cells on the ends of tentacles.

Lesson 1 – Animals without a Backbone Vocabulary words: mollusk- an invertebrate that has a soft body and a shell

Lesson 1 – Animals without a Backbone Vocabulary words: echinoderm- a spiny skinned invertebrate

Lesson 1 – Animals without a Backbone Vocabulary words: endoskeleton- an internal supporting structure

Lesson 1 – Animals without a Backbone Vocabulary words: arthropod- an invertebrate with jointed legs, a body that is divided into sections, and an exoskeleton

Lesson 1 – Animals without a Backbone Vocabulary words: exoskeleton- a hard covering that protects the bodies of some invertebrates

Lesson 1 – Animals without a Backbone How do animals differ? 1. Symmetry- some animals have symmetry while others do not.

Lesson 1 – Animals without a Backbone Backbone or no backbone- 95% of all animals do not have a backbone (they are invertebrates).

Lesson 1 – Animals without a Backbone What are some invertebrates?

Lesson 1 – Animals without a Backbone 1. Sponges -They do not have symmetry -They live underwater.

Lesson 1 – Animals without a Backbone 1. Sponges

Lesson 1 – Animals without a Backbone 2. Cnidarians -Jellyfish and Corals -Use stinging cells to stun prey.

Lesson 1 – Animals without a Backbone 2. Cnidarians

Lesson 1 – Animals without a Backbone 3. Mollusks -Snails and Slugs are the only ones to live on land. -Clams, oysters, squid, and octopi are examples.

Lesson 1 – Animals without a Backbone 3. Mollusks

Lesson 1 – Animals without a Backbone 4. Echinoderms -Sea Urchins -Have an endoskeleton

Lesson 1 – Animals without a Backbone 4. Echinoderms

Lesson 1 – Animals without a Backbone 5. Arthropods -This is the largest invertebrate group. -Crabs, shrimps, insects, and spiders are some examples.

Lesson 1 – Animals without a Backbone 5. Arthropods

Lesson 1 – Animals without a Backbone 6. Flatworms -They have flat bodies -They are the simplest worms. -Some live inside of other animals.

Lesson 1 – Animals without a Backbone 6. Flatworms

Lesson 1 – Animals without a Backbone 7. Roundworms -They have thin bodies with pointed ends. -Most live inside of other animals.

Lesson 1 – Animals without a Backbone 7. Roundworms

Lesson 1 – Animals without a Backbone 8. Segmented Worms -Earthworms, sandworms, and leeches are examples. -Most live on land.

Lesson 1 – Animals without a Backbone 8. Segmented Worms