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This is a list of dates associated with the prehistoric peopling of the world (first known presence of Homo sapiens). The list is divided into four categories, Middle Paleolithic (before 50,000 years ago), Upper Paleolithic (50,000 to 12,500 years ago), Holocene (12,500 to 500 years ago) and Modern ( Age of Sail and modern exploration).
They evolved the first erythrocytes and thrombocytes. [16] 460-430 Ma A placoderm. The Placodermi were the first jawed fishes (Gnathostomata); their jaws evolved from the first gill/pharyngeal arch and they largely replaced their endoskeletal cartilage with bone and evolved pectoral and pelvic fins.
Human history is the record of humankind from prehistory to the present. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers.They migrated out of Africa during the Last Ice Age and had spread across Earth's continental land except Antarctica by the end of the Ice Age 12,000 years ago.
There were in fact two splits between the human and chimpanzee lineages, with the first being followed by interbreeding between the two populations and then a second split. The suggestion of a hybridization has startled paleoanthropologists, who nonetheless are treating the new genetic data seriously.
The first seaborne human migrations were by the Austronesian peoples [dubious – discuss] originating from Taiwan known as the "Austronesian expansion". [144] Using advanced sailing technologies like catamarans , outrigger boats , and crab claw sails , they built the first sea-going ships and rapidly colonized Island Southeast Asia at around ...
The word "race", interpreted to mean an identifiable group of people who share a common descent, was introduced into English in the 16th century from the Old French rasse (1512), from Italian razza: the Oxford English Dictionary cites the earliest example around the mid-16th century and defines its early meaning as a "group of people belonging to the same family and descended from a common ...
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At long irregular intervals, Earth's biosphere suffers a catastrophic die-off, a mass extinction, [9] often comprising an accumulation of smaller extinction events over a relatively brief period. [10] The first known mass extinction was the Great Oxidation Event 2.4 billion years ago, which killed most of the planet's obligate anaerobes.