define vertibrate with different classes
Answers
who have backbone is called vertibrate
an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes.
Its classes are:
1. Pisces : this group contain fishes. They are aquatic, streamlined, oviparous and lay eggs in water. They have a tail for its movement, have two chambered heart. They obtain oxygen dissolve in water. They are cold-blooded. Respire through gills.
2. Amphibia: They lack scales, having mucus glands, and have three chambered heart. They are cold-blooded. Respire through gills or lungs. They are oviparous and lay eggs on water surface.
3. Reptila : the are cold-blooded, have scales and breathe through lungs, have three chambered heart. They are oviparous and lay eggs on land. In this group only crocodile os four chambered.
4. Aves: these are warm-blooded and have four chambered heart. They are oviparous . Their forelimbs are modwified for flight. They beaks but not teeth.
5. Mammals : They have four chambered heart and warm blooded. They are viviparous and have mammary gland to feed their young ones. They have sweat and oils gland and hair over body. They have well developed spinal chord.