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Map of early human migrations based on the Out of Africa theory; figures are in thousands of years ago (kya). [1]The peopling of the Americas began when Paleolithic hunter-gatherers (Paleo-Indians) entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the ...
[9] [10] If like preferred like, leucistic animals (such as white peacocks) would be sexually attracted to one another, and a leucistic subspecies would come into being. Koinophilia predicts that this is unlikely because leucistic animals are attracted to the average in the same way as are all the other members of its species.
North American species were thus products of a larger and more competitive arena, [n 21] [88] [130] [131] where evolution would have proceeded more rapidly. They tended to be more efficient and brainier , [ n 22 ] [ n 23 ] generally able to outrun and outwit their South American counterparts, who were products of an evolutionary backwater.
Leaves have evolved multiple times - see Evolutionary history of plants. They have evolved not only in land plants, but also in various algae, like kelp. [214] Prickles, thorns and spines are all modified plant tissues that have evolved to prevent or limit herbivory, these structures have evolved independently a number of times. [215]
Human footprints in White Sands National Park in New Mexico. Stone, bone, and wood artifacts and animal and plant remains dating to 16,000 BP in Meadowcroft Rockshelter, Washington County, Pennsylvania. (Earlier claims have been made, but not corroborated, for 50,000 BP at sites such as Topper, South Carolina.) [61] [62] [63] Europe: Sicily: 20
David Bustos heard about the “ghost tracks” when he first went to White Sands National Park in New Mexico to work as a wildlife scientist in 2005.
[8] [9] In 2014, geneticist Anna-Sapfo Malaspinas of the Center for GeoGenetics at the University of Copenhagen published a study in Current Biology that found human genetic evidence of contact between the populations of Easter Island and South America, dating to approximately 600 years ago (i.e. 1400 CE ± 100 years). [10]
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