The animals with a true vertebral column and internal skeleton are called Vertebrate. They are bilaterally symmetrical, triploblastic and coelomic. Chordates have the following common features:
have a notochord
have a dorsal nerve chord
have paired gill pouches
Vertebrates are grouped into five class:
PISCES
It includes fish and other aquatic animals
Their skin is covered with scales
Oxygen dissolved in water(H2O) is obtained by using gills.
Their body is streamlined and lay eggs for reproduction.
Heart is two chambered and are cold-blooded.
Eg : Dog fish, Rohu etc.
AMPHIBIA
These animals don’t have scales but have a moist skin.
Three chambered heart is found in them
They possess gills as well as lungs for reproduction.
Eggs are laid in water however they are found in water as well as on land.
Eg : Toad, Salamander, Hyla etc.
REPTILIA
They are cold-blooded and have three chambered heart.
Scales are present on their skin and breath through lungs.
Eggs of these creatures have a hard covering and do not need to be laid in water.
Eg : Snakes, Lizards, Turtles etc
AVES
Aves are warm blooded creatures with a four chambered heart.
They lay eggs and have modified forelimbs for flight.
Lungs are there for them to respire.
Feathers act as a covering outside.
Eg : Ostrich, Pigeon, Sparrow etc.
MAMMALIA
Mammals are warm blooded with four chambered heart.
They have mammary glands to feed their young ones.
Body is covered with skin consisting of hairs, sweat and oil glands.
Collection of Pedagogic Phrases ;) 