What is the main characteristic of vertebrates?
Skekeleton without a middle bone.
Skeleton with cartilages.
Internal skeleton with a middle bone

Vertebrates need to survive:
Food, good temperature and living spaces.
Food,water and good temperature.
Air,water and food.

Mammals have got:
Feathers and wings.
Scales.
Hair.

Vertebrates with a more complex brain and body system are:
Birds
Mammals
Reptiles

Vertebrates that change to adult in a gradual way are:
Amphibians
Reptiles
Birds

According what vertebrates eat,we have these groups of animals:
Carnivorous,herbivorous and omnivorous.
Carnivorous and herbivorous.
Carnivorous and omnivorous.