What makes an animal an animal?
The scientist make experiments to study the animals and analyze the types to classification.
The scientists study all the places in the world to find types of animals.
The animals that are born through a female animal are called mammals. And they eat milk of the mother during a year.
The kingdom of animals is a group of organisms that share characteristics
The scientists discovered animals very rare, like the shark can not stop swimming because they sink and die
Finally the scientists organized the animals and they placed them in 2 groups invertebrates and vertebrates
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