Dating practices of peru
Dating practices of peru - dating site initial messages
Modern humans colonized most of the inhabitable world during the Middle and Upper Paleolithic periods. The Americas were colonized by a great migration across the Bering land bridge, which connected Siberia and Alaska.
Amphibians evolved into reptiles, which lay hard-shelled eggs. 50 - "History of technology", Encyclopedia Britannica. 51 - "Guns, Germs, and Steel: The Fates of Human Societies", Jared Diamond.
About 4.5 billion years ago, our solar system (the sun and its planets) formed via the accretion of dust into spheres; Earth is therefore roughly 4.5 billion years old.
Life began about 3.5 billion years ago, with the appearance of single-celled marine organisms; since then, evolution has continuously given rise to new forms of life. Increasingly large and complex types of multicellular life emerged, with one branch of evolution leading to fish.
Fish are the original vertebrates (animals with a backbone) and the ancestors of all other vertebrate groups.
Vertebrates made the transition to land-based life when fish evolved into amphibians: cold-blooded tetrapods that lay aquatic eggs.
Some of these species migrated out of Africa, settling regions of Eurasia.
All would eventually go extinct, however, leaving the world to be dominated by a single human species: .
While glacial periods made survival more difficult, they also lowered the sea level, easing human colonization of the world.
We currently live in an interglacial period, which began ca. About 14 billion years ago, the Big Bang gave birth to a universe containing pockets of dust.
The stone age can be divided into the Paleolithic ("Old Stone Age"), during which all humans were hunter-gatherers; the Mesolithic ("Middle Stone Age"), the transitional phase to agricultural life; and the Neolithic ("New Stone Age"), when humans subsisted through agriculture.
The Paleolithic, which spans over ninety percent of human existence, can be further divided into three parts.
Sub-Saharan Africa was one region where tree-dwelling mammals thrived.