sharks
whales
lung fishes
rays
D. rays
Coelocanth
Diodon
Sturgeon
Labeo
olfactoreceptors
rheoreceptors
gustoreceptors
chemoreceptors
a rounded body with ventral gill clefts
a flattened body with dorsal gill clefts
a flattened body with ventral gill clefts
any of these
sharks
whales
lung fishes
rays
Primates
Aves
Crocodiles
Pisces
Placoid scales
Ventral mouth
Operculum
Five pairs of gill slits
Trygon
Torpedo
Chimaera
Sphynta
the nature of their scales
the position of the mouth
the position of gill slits
the kind of the tail fin
Scoliodon
Electric ray
Whale
Lung fish
Five pairs of gills covered with operculum
Homocercal tail
Eight pairs of gills
Any of these
10 volts
100 volts
50 volts
150 volts
respiration
excretion
movement
none of these
dog fish
bony fishes
both (a) and (b)
all fishes
a shell
egg case of skate fishes
a colony of skate fishes
none of these
nostrils
mouth
gill slits
swimming bladder
live at the bottom of rivers
live in shallow streams
are active swimmers
live in sea water
dorsal
ventral
caudal
pelvic
anandromous migration
catadromous migration
cartilaginous fish
none of these
Placoid scales
Heterocercal tail fin
Ventrally placed mouth
Operculum
ampullae of lorenzini
lateral line system
stato-acoustic organs
neuromast organs
Dasyatis
Chimaera
Sphyma
Torpedo
Pterois
Fistularia
Gambusia
None of these
anterior fins
ray fins
pectoral fins
paired fins
sharks
rays
whales
lung fishes
cat fish
dog fish
flying fish
seahorse
teleosts
sharks
lung fishes
rays
Osteichthyes
Chondrichthyes
Dipnoi
Holocephali
cartilaginous fishes
bony fishes
both (a) and (b)
all fishes except sharks
Sharks
Stingray
Dogfish
Catfish
vitamin A
iron
calcium
vitamin B complex