parapodia
pseudopodia
setae
tube feet
D. tube feet
ctenidia
dermal branchiae
book lungs
trachea
spines
tube feet
integumentary structures
none of these
Snail
Slug
Nereis
Sea-urchin
synapta and antedon
astrias and asterina
ophiothrix and ophioderma
all of these
pluteus
echinopluteus
bipinnaria
auricularia
sand dollar
sea cucumber
sea flies
sea horse
digestive system
water vascular system
canal system
none of these
bipinnaria
glochidium
auralia
echinus
tube feet
lobopodia
cephalopodia
rhizopodia
coelenterates
marine arthropods
echinodermates
sponges
Asteroidea
Crinoidea
Ophiuroidea
Holothuroidea
locomotion
respiration
feeding
all of these
parapodia
pseudopodia
setae
tube feet
(a) Starfish
(b) Brittle star
(c) Sea lily
(d) None of these
Axial sinus
Dermal papillae
Tube feet
Tiedamann bodies
Schizocoelic coelom
Water vascular system
Spines in the body mass
Marine habitat
Sea cucumber
Sea lily
Sea urchin
Sea star
Antedon
Echinocardium
Ophiothrix
Pentaceros
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
coelenterates
polychaetes
echinodermates
hemichordates
movable
immovable
prehensile
all of these
torneria
onchosphere
trochophore
bipinnaria
mouth apparatus
exoskeleton
skeletal system
bioluminscent organ
sea-hares
sea-stars
devil fish
sea fans
Nervous system with a large brain
Respiratory system
System of internal seleton
Excretory system
Sea star
sea urchin
Sea cucumber
Feather star
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
Holothuria (sea cucumber)
Echinus (sea urchin)
Echittocardium (sand dollar)
Antedon (feather star)
excretion
absorption
reproduction
respiration
Ophiothrix
Pentaceros
Antedon
None of these