An extinction event is a broad and quick decline in the biodiversity on earth. It occurs when numerous species go extinct within a short period of time, for example, dinosaurs.
There are various distinctive characteristics that set mammals apart from other vertebrate creatures. Mammals of all species generate and exude milk from their mammary glands to nourish their young. They also have hair on their body, albeit the amount of hair varies across different mammalian species.
All warm-blooded, hair-covered vertebrates, including humans, are considered mammals. They have a more developed brain than other species of mammals, and they provide milk for their offspring.
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