Dinosaurs first walked the earth 230 million years ago and dominated the land for 160 million years. They became extinct 65 million years ago during the Cretaceous period. More »

Australopithecus Africanus lived during the late Pliocene and early Pleistocene epochs, about 3.3 to 2.1 million years ago. Thought to be a direct ancestor of modern humans, these early hominids possessed a combination o... More »

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Dinosaurs lived on Earth for about 175 million years, until they were entirely wiped out by the K-T extinction event at the end of the Cretaceous Period. They lived during the Mesozoic Era, and examples of dinosaurs can ... More »

Australopithecus Africanus lived during the late Pliocene and early Pleistocene epochs, about 3.3 to 2.1 million years ago. Thought to be a direct ancestor of modern humans, these early hominids possessed a combination o... More »

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The first occurrence of simple animals was approximately 600 million years ago. These were characterized as multi-cellular organisms with basic structures, but no true tissues. An example would be a jellyfish or marine s... More »

The Triassic period began approximately 248 million years ago and ended 206 million years ago; although, some sources date it to be between 251 and 199 million years ago. It was followed by the Jurassic period; it was th... More »

Life began on Earth about 3.8 billion years ago, a mere 700 million or so years after the Earth was formed. However, these simple life forms remained mostly microscopic until about 570 million years ago. More »

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