locomotion
respiration
feeding
all of these
D. all of these
sea-hares
sea-stars
devil fish
sea fans
sand dollar
sea cucumber
sea flies
sea horse
number of arms
structure of the ambulacral groove
tube feet
pedicellariae
tube feet
lobopodia
cephalopodia
rhizopodia
bipinnaria
glochidium
auralia
echinus
Star fish
Sea fan
Ship worm
None of these
coelenterates
polychaetes
echinodermates
hemichordates
Sea cucumber
Sea lily
Sea urchin
Sea star
herbivorous
omnivorous
carnivorous
none of these
Ophiothrix
Pentaceros
Antedon
None of these
torneria
onchosphere
trochophore
bipinnaria
ctenidia
dermal branchiae
book lungs
trachea
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
Axial sinus
Dermal papillae
Tube feet
Tiedamann bodies
pluteus
echinopluteus
bipinnaria
auricularia
digestive system
water vascular system
canal system
none of these
Antedon
Echinocardium
Ophiothrix
Pentaceros
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
Sea hares
Brittle stars
Star fishes
Sea fish
Nervous system with a large brain
Respiratory system
System of internal seleton
Excretory system
Schizocoelic coelom
Water vascular system
Spines in the body mass
Marine habitat
Holothuria (sea cucumber)
Echinus (sea urchin)
Echittocardium (sand dollar)
Antedon (feather star)
redia and cercaria
bipinnaria and brachiolaria
trochophore and aurecularia
none of these
Sea stars
Cake urchins
Sea lilies
Sea cucumbers
movable
immovable
prehensile
all of these
Sea star
sea urchin
Sea cucumber
Feather star
excretion
absorption
reproduction
respiration
Sand dollar
Jelly fish
Silver fish
All of these
Starfish
Jellyfish
Cuttlefish
Fresh water mussel
Asterias
Antedon
Echinus
Ophiothrix