external stimuli		a jellyfish
anthropod		having 3 pairs of walking legs
insect		sea anemone
sea cucumber		having both eggs
invert		flatworm that has 2 hosts
bilaterla symmetry		1 line of symmetry
insect		are spinless
polyp		has a "foot"
cambrian explosion		class of clams
Isopodses		class of slugs
rotifera		echinoderma w/ no suckers on tube feet
bivalve		mesoderms made array of variations
mollusk		predators stressed adaptive radiations
sponge		called sea squirts
tapeworm		small
urochordates		diverged from flatworms
echinodermata		having 2 pairs of legs per segment
radial symmertry		used to take in food, water and sperm in sponge
hermaphroditic		have feathery gill
gastropod		class of octopus
internal stimuli		having 2 pairs of antenna
chordata		5% of animals
zygote		echinoderm that lacks hard exoskeleton
cephalochchordata		flatworm w/ flame cells for excretion
nephridia		has no nerves or muscles
crustacean		diverged from echinoderms
gastrula		blastula developing mouth and anus
flukes		most successful group of animals
shrimp		95% of animals
blastula		hollow ball of zygote
brittle stars		fertilized egg
round worm		flatworm w/ hooks or suckers
millipede		symmetrical everywhere
vertebrate		have trache
medusa		have 7000 species
spiders		have book lungs
centipede		go by pill bugs
cephaolpoda		used in excretion for earthworms
planaria		having 1 pair of legs per segment
collar cell		produced all major body plans