Aquatic and Marine Biology

This is the correct option. A starfish captures small animals like worms, snails, etc with the help of its tube feet, that is present on its body.  

Masticatory apparatus called Aristotle lantern is present in sea urchins. It consists of 5 strong and sharp teeth.

Sea contains water and desert contains sand.

A bird uses its wings to move and a fish uses its fins to move.

It is the type of excretion, in which ammonia is the main nitrogenous waste material. Such animals are called ammonotetic. It is found in aquatic animal groups like, sponges, coelentrates, crustaceans, echinoderms, bony fish, tadpole larvae and salamander.

Fish have a single circulatory system where blood passes through the heart only once during each complete circuit of the body.

Birds, like mammals, have a completely four-chambered heart, ensuring efficient oxygen delivery to support their high metabolic rates.

Stone fish is a true fish. It belongs to the class Pisces of phylum Chordata.

 This is the correct answer.

This is the correct answer. Whales are acquatic animals and are mammals.

This is the correct answer. Only frogs from the given animals lay eggs in water.

Crocodile is the only reptile with a four chambered heart, two atria and two ventricles.

Initiation of heart beat may be by extrinsic nerves (neurogenic) as in many adult arthropods, or by an internal pacemaker (myogenic) as in vertebrates.

 All fishes have two-chambered heart.

 Chondrichthyes include cartilaginous fish.