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STUDIES - Fossils around the world
Vertebrate - Mamals
Mammals are a class of vertebrate animals characterized by the possession of mammary glands, from which they derive their name, as well as sweat glands, hair, peculiar articulation between the skull and the mandible (between squamosal bone and the dental bone), three middle ear bones used in hearing, and a neocortex region in the brain.
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