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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 ...
The mass release of 28,800 objects into the ocean at one time offered significant advantages over the standard method of releasing 500–1000 drift bottles. The recovery rate of objects from the Pacific Ocean is typically around 2%, so rather than the 10 to 20 recoveries typically seen with a drift bottle release, the two scientists expected ...
In addition, microbes are becoming more abundant due to aquaculture, the farming of aquatic life, and human waste polluting the ocean. These practices introduce new pathogens and excess nutrients into the ocean, further encouraging the survival of microbes. [46] Some of these microbes have wide host ranges and are referred to as multi-host ...
Migratory species include some of the most iconic animals on the planet, like elephants. These elephants are grazing after spraying sand on their bodies at Kimana Sanctuary in Kimana, Kenya -- a ...
According to the stories, Yupanqui returned from the expedition bringing back with him black-skinned people, gold, a chair made of brass, and the skin of a horse or an animal similar to a horse. Del Busto speculated the "black-skinned people" may have been Melanesians , while the animal skin may have belonged to a Polynesian wild boar that was ...
Portuguese artist Paulo de Oliveira's shocking composite images of animals being strangled by discarded nets and gorging on plastic rubbish serve as a stark warning of the damage caused by human ...
Island hopping is the crossing of an ocean by a series of shorter journeys between islands, as opposed to a single journey directly to the destination. Often this occurs via large rafts of floating vegetation such as are sometimes seen floating down major rivers in the tropics and washing out to sea, occasionally with animals trapped on them. [ 1 ]
The Summary. Many people have a tiny slice of Neanderthal DNA, evidence of interbreeding between the species and ancient human ancestors. Two new studies suggest that interbreeding occurred during ...