The period of fishes is

Which period is called period of fishes?

Salmon fishes are group of fishes that belong to :

Cartilagenous fishes differ from bony fishes in having……………….. .

Cartilaginous fishes are different from bony fishes in

Cartilaginous fishes are different from bony fishes in

Cartilaginous fishes are different from bony fishes in

Cartilaginous fishes are different from bony fishes in

The number of star fish and gold fish in an aquarium is in the ration 3:7. After adding 25 more gold fish into the aquarium,the new ratio of the star fish to gold fish became 6:19. How many star fish and gold fish are there in the aquarium now?

Endoskeleton of fishes are made up of cartilage and bone. Classify the following fishes as cartilaginous or bony : Torpedo, sting ray,Dog fish,Rohu, Angler fish, Exocetus.