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