Select the Taxon mentioned that represents both marine and freshwater species: 
Cnidarians are aquatic, mostly marine, solitary or colonial sessile or free-swimming radially symmetry animals while members of Ctenophora, Cephalochordata, Echinodermata are found exclusively in the marine environment.
So the correct answer is 'Cnidaria'.
Which one of the following living organisms completely lacks a cell wall? 
Gorgonia (sea-fan) is an animal and all animals lacks a cell wall.
Planaria possesses high capacity of: 
A marine cartilaginous fish that can produce electric current is: 
Torpedo is a sluggish fish. It is carnivorous. The prey is firstly killed by electric shock. The shock can also be harmful to human beings.
Which of the following animals is not viviparous? [2015 RS]
Platypus is an oviparous animal (egg-laying). It belongs to the class- Mammalia.
Which of the following represents the correct combination without any exception?
A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is: [2015 RS]
Body having meshwork of cell, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of phylum ______. [2015 RS]
Which of the following features is not present in the phylum - Arthropoda?
Which of the following characteristic feature always holds true for the corresponding group of animals? 
Which one of the following characteristics is not shared by birds and mammals ?