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Precambrian
The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the ... > more -
Homo erectus
Homo erectus ("upright man") is a hominin species that is believed to be an ancestor of modern humans (with Homo heidelbergensis usually treated as an intermediary step). The species is found from ... > more -
Prokaryote
Prokaryotes are organisms without a cell nucleus, or indeed any other membrane-bound organelles, in most cases unicellular (in rare cases, multicellular). This set of characteristics is distinct from ... > more -
Homo habilis
Homo habilis ("handy man", "skillful person") is a species of the genus Homo, which lived from approximately 2.5 million to 1.8 million years ago at the beginning of the Pleistocene. The definition ... > more -
Recent single-origin hypothesis
The single-origin hypothesis (or Out-of-Africa model) is one of two accounts of the origin of anatomically modern humans, Homo sapiens. Because of the scarcity of fossils and the discovery of ... > more -
Ichthyosaur
Ichthyosaurs were giant marine reptiles that resemble a dolphin with large teeth. They lived during a large part of the Mesozoic era, and appeared about 250 million years ago (Ma), slightly earlier ... > more -
Homo floresiensis
Homo floresiensis ("Man of Flores") is a species in the genus Homo, remarkable for its small body, small brain, and survival until relatively recent times. It is thought to have been contemporaneous ... > more -
Neandertal interaction with Cro-Magnons
Neanderthals apparently co-existed with anatomically modern humans beginning some 100,000 years ago. However, about 45,000 years ago, at about the time that stoneworking techniques similar to those ... > more
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