An extinction event is a significant and rapid loss of the biodiversity of the planet. It happens when a large number of species perish suddenly, as the dinosaurs.
Why is it referred to as a mammal?
Mammals are distinguished from other vertebrate animals by a number of distinguishing traits. All species of mammals produce and secrete milk from their mammary glands to feed their young. Even though the amount of hair differs amongst various mammalian species, they also have hair on their bodies.
The human being: a mammal?
Mammals are all warm-blooded, hair-covered vertebrates, including people. They provide milk for their young and have a brain that is more developed than those of other mammal species.
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