Aquatic and Marine Biology

Neoceratodus is a well-known living Australian lungfish under Class Osteichthyes of Phylum Chordata.

The tube of poison is situated in the snake's mouth.

Both (1) and (2): Cobra and Duboiyo are poisonous snakes and brown - water snake is a non-poisonous snake.

Brown water snake: It is a non-poisonous snake found in Southeast United State. It is found in swamps and streams.

Amphibians - ‘Amphi' means 'both' and 'bios' means life. Animals that spend some time on land must breed (mate and produce young ones) and develop into an adult under water. Amphibians possess both lungs and gills for respiration. For example, frogs, toads and salamanders. Therefore, they can live both on land and in water. 

There are many kinds of fish, some with skeletons made entirely of cartilage, such as sharks, and some with a skeleton made of both bone and cartilage, such as tuna or rohu.

stify>(2) Dog - (c) Mammal

The living things that give birth to young ones are called mammals.

As fish inhales oxygen through gills, similarly earthworm inhales through its skin.

Whale does not lay eggs. It lives in water, and looks like fish.

This is the correct option as frogs and lizards have a three-chambered heart that consists of two atria and one ventricle.

Octopus is commonly known as devil fish. Sepia is commonly known as cuttle fish.

The practice of growing four to five fish species in a single fish pond is known as composite fish culture. These species are selected so that they do not compete for food among them due to different types of food habitats. 

Amphioxus (lancelet) is a chordate but not a vertebrate - it lacks a true vertebral column (backbone). It belongs to the subphylum Cephalochordata, which retains the primitive chordate characteristics (notochord, dorsal nerve cord, pharyngeal slits, post-anal tail) but never develops vertebral elements. Oryctolagus (rabbit), Fish, and Sparrow are all vertebrates.

Platypus is the only mammal that lays eggs instead of giving birth to young ones.