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Classification of animals

According to the internal structure, how many types of animals are there? There are two types: vertebrate and invertebrate.
What is the main characteristic of the invertebrates? The main characteristic is that they don't have spine.
What kind of animals can you find in biped animals? I can find animals such as birds.
According to the environment that animals could live, how many can you find? I can find two types of environment: aquatic and terrestrial.
According to the food that they could eat, how many types of animals can you name? I can name three types of animals: herbivorous, carnivorous and omnivorous.
What examples of animals can you find in omnivorous? I can find animals like pigs and bears.
What examples of animals can you find in carnivorous? I can find animals like tigers, lions, wolves, etc.
What type of vertebrates can you find? I can find mammals, birds, fishes, reptiles and amphibians.
What do vertebrates have in common? They all have spine.
How do mammals breathe? They breathe with their lunges.
Do aquatic mammals have hair? No, they don't. They are smooth.
Can you name some examples of mammals? I can name horse, dog and dolphin.
How many legs do birds have? How many wings do they have? They have 2 legs and 2 wings.
Do birds have feather? Yes, they have.
What do fishes and reptiles have in common? They both have scales.
What do reptiles, fishes, amphibians and birds have in common? They are oviparous.
What two types of classification have invertebrates? One with corporal protection and the other one without corporal protection.