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c. 5.96–5.33 Ma – Messinian Salinity Crisis: the precursor of the current Strait of Gibraltar closes repeatedly, leading to a partial desiccation and strong increase in salinity of the Mediterranean Sea. c. 5.4–6.3 Ma – Estimated age of the Homo/Pan (human vs. chimpanzee) split. c. 5.5 Ma – Appearance of the genus Ardipithecus
The Sub-Atlantic period began about 225 BC (estimated on the basis of radiocarbon dating) and has been characterized by increased rainfall, cooler and more humid climates, and the dominance of beech forests. The fauna of the Sub-Atlantic is essentially modern although severely depleted by human activities.
Species go extinct constantly as environments change, as organisms compete for environmental niches, and as genetic mutation leads to the rise of new species from older ones. 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 ...
Earliest development of bilateral symmetry, mesoderm, head (anterior cephalization) and various gut muscles (and thus peristalsis) and, in the Nephrozoa, nephridia (kidney precursors), coelom (or maybe pseudocoelom), distinct mouth and anus (evolution of through-gut), and possibly even nerve cords and blood vessels. [8]
The agreement provides for the protection of the Antarctic environment through five specific annexes on marine pollution, fauna, and flora, environmental impact assessments, waste management, and protected areas. It prohibits all activities relating to mineral resources except scientific.
Thus, technologies can create "order" in the human economy (i.e., order as manifested in buildings, factories, transportation networks, communication systems, etc.) only at the expense of increasing "disorder" in the environment. According to several studies, increased entropy is likely to correlate to negative environmental impacts.
21 kya: Artifacts suggest early human activity occurred in Canberra, the capital city of Australia. [70] 20 kya: Kebaran culture in the Levant: beginning of the Epipalaeolithic in the Levant. [71] 20 kya: Theorized earliest date of development of traditional Arctic clothing like those used by Arctic Eurasians and Inuit. [72]
For events dating from the formation of the planet to the rise of modern humans see: Timeline of natural history, Timeline of the evolutionary history of life and Timeline of human evolution. For events dating from the first appearance of Homo sapiens to before the invention of writing see: Timeline of prehistory