Invertebrates
More complex invertebrates
Echinoderms
Simplest Invertebrates
Arthropods
Corals, sponges, and jellyfish.
Earthworms
Ocean
Soil
sea urchins, sea stars
salt water have body parts in multiples of five
crustaceans
Largest group
exterior shell, five pairs of jointed limbs
spiders
two body segments, eight legs
insects
antennae
mollusk
squid
have shells for protection
octopi
have internal shell
do not have a shell at all