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Prehistory means literally "before history", from the Latin word for "before," ', and Greek '.

Human prehistory is the period from the time that behaviorally and anatomically modern humans first appear until the appearance of recorded history following the invention of writing systems.

Since both the time of settlement of modern humans and the evolution of human civilisations differ from region to region, prehistory starts and ends at different moments in time, depending on the region concerned.It was first used in the 1830s by a French archeologist Paul Tournal.It was first used in English by Daniel Wilson in 1851.

Biologically, a child (plural: children) is a human being between the stages of birth and puberty.

The legal definition of child generally refers to a minor, otherwise known as a person younger than the age of majority.

Dinosaurs are a diverse group of reptiles of the clade Dinosauria that first appeared during the Triassic.

Although the exact origin and timing of the evolution of dinosaurs is the subject of active research, the current scientific consensus places their origin between 231 and 243 million years ago.

They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201 million years ago.

Their dominance continued through the Jurassic and Cretaceous periods and ended when the Cretaceous–Paleogene extinction event led to the extinction of most dinosaur groups 66 million years ago.