Sand dollar
Jelly fish
Silver fish
All of these
A. Sand dollar
Asterias
Antedon
Echinus
Ophiothrix
Sea hares
Brittle stars
Star fishes
Sea fish
Sea star
sea urchin
Sea cucumber
Feather star
number of arms
structure of the ambulacral groove
tube feet
pedicellariae
digestive system
water vascular system
canal system
none of these
A fresh water echinoderm
An ancient Greak ship lantern shaped structure connected with balancing system of seal lily
A masticatory apparatus connected with digestive system in sea urchin
A seive plate connected with ambulacral system in sea star
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
coelenterates
marine arthropods
echinodermates
sponges
Sea cucumber
Sea lily
Sea urchin
Sea star
bipinnaria
glochidium
auralia
echinus
synapta and antedon
astrias and asterina
ophiothrix and ophioderma
all of these
mouth apparatus
exoskeleton
skeletal system
bioluminscent organ
Schizocoelic coelom
Water vascular system
Spines in the body mass
Marine habitat
torneria
onchosphere
trochophore
bipinnaria
Starfish
Jellyfish
Cuttlefish
Fresh water mussel
Sea stars
Cake urchins
Sea lilies
Sea cucumbers
Star fish
Sea fan
Ship worm
None of these
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
excretion
absorption
reproduction
respiration
tube feet
lobopodia
cephalopodia
rhizopodia
sand dollar
sea cucumber
sea flies
sea horse
echinodea
holothuroidea
asteroidea
ophiuroidea
parapodia
pseudopodia
setae
tube feet
Asteroidea
Crinoidea
Ophiuroidea
Holothuroidea
ctenidia
dermal branchiae
book lungs
trachea
haemal system
digestive system
ambulacral system
reproductive system
coelenterates
polychaetes
echinodermates
hemichordates
spines
tube feet
integumentary structures
none of these
an exoskeleton
a spiny skin
bilateral symmetry
gastrovascular cavity
Sand dollar
Jelly fish
Silver fish
All of these