Invertebrates
Simplest
Invertebrates
Corals Sponges Jellyfish
Ocean
Earthworms
Soil
More Complex Invertebrates
Mollusks
Squid
Have shells for protection
Octopi
Have internal shell
Do not have shell at all
Echinoderms
Sea urchin Sea stars
Salt water have body parts in multiples of five
Arthropods
Crustaceans
Largest group
Exterior shell, five pairs of jointed limbs
Spiders
Two body segments, eight legs
Insects
Antennae, jaws, three body segments