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FORMATION OF THE EARTH

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Replicating molecules (the precursors of DNA) form.

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Unicellular life evolves. Photosynthetic bacteria begin to release oxygen into the atmosphere.

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Multi-cellular marine organisms are common. The diverse assortment of life includes bizarre-looking animals like Wiwaxia.

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Fish-like vertebrates evolve. Invertebrates, such as trilobites, crinoids, brachiopids, and cephalopods, are common in the oceans.

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Arthropods move onto the land. Their descendants evolve into scorpions, spiders, mites, and millipedes.

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Land plants evolve, drastically changing Earth's landscape and creating new habitats.

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Four-limbed vertebrates move onto the land as seed plants and large forests appear. The Earth's oceans support vast reef systems.

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The supercontinent called Pangea forms. Conifer-like forests, reptiles, and synapsids (the ancestors of mammals) are common.

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Over 90% of marine life and 70% of terrestrial life go extinct during the Earth's largest mass extinction. Ammonites are among the survivors.

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Dinosaurs and mammals evolve. Pangea has begun to break apart.

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As the continents drift toward their present positions, the earliest flowers evolve, and dinosaurs dominate the landscape. In the sea, bony fish diversify.

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A massive asteroid hits the Yucatan Peninsula, and ammonites and non-avian dinosaurs go extinct. Birds and mammals are among the survivors.

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In Africa, an early hominid, affectionately named "Lucy" by scientists, lives. The ice ages begin, and many large mammals go extinct.

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As the continents drift toward their present positions, the earliest flowers evolve, and dinosaurs dominate the landscape. In the sea, bony fish diversify.

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Anatomically modern humans evolve. Seventy thousand years later, their descendents create cave paintings — early expressions of consciousness.