SpongesSimplest animalLives in salt waterTwo layers of cells

Coral, sea flowers, and Jellyfish Live in ocean Have tentacles with stinging cells Float to move – trap food Coral stays in one place

Flatworms Flat bodies Parasites Tapeworms most common

Round worms Many species Parasites Hook worms found in soil Round worms found in dirty water

Segmented worms Body is in segments – parts Earth worms – tunnel through soil Leeches – blood sucking – used in medicine

Spiny skinned Starfish, sea urchins, sea cucumbers, sand

dollars Starfish most well known, have tubed feet Starfish turn stomaches inside out to eat clams Starfish are not fish

mollusks Can live anywhere Most have shells and soft bodies Have muscular foot Snails, clams, octopus, squid

Arthopods Having joined legs –section bodies Ectoskeleton Largest group of invertebrates Includes insects,, centipedes, millipedes

arachnids , crustaceans

Insects 6 legs 3 body parts, head, abdomin, throax Most have wings, some 2 sets Pair of antenne on head

Arachnids 8 legs 2 body parts, head – body Spiders, ticks, horseshoe crabs

Crustaceans

Considered an acrahnid 8 legs, 2 body parts

Centipedes and millipedes Centipedes have one pair of legs per segment

they eat insectsMillipedes have two pair of legs per section

decomposers

Which one A or B is the millipede