Invertebrates.

Invertebrates are animals without a backbone. They are grouped based on their body shape and structure.

Exoskeleton.

A hard outer covering on the outside of an animal’s body.

1. Porifera.

• Full of tiny holes.

• Live in water.

2. Cnidaria.

• Have tentacles.

• Can sting.

3. Annelida.

• worms.

• Body is divided into little rings.

4. Arthropoda.

• Jointed legs.

• hard exoskeleton.

5. Mollusca.

• Soft body.

• some with shells.

  
  

  Fun Fact

  When a crab or insect grows, it has to break and shed its exoskeleton because the shell cannot stretch this process is called molting.