Changes in climate shifted vegetation and the overall habitat, meaning the paths of two ancient humans crossed quite often.
Shifts in the earth's climate made sex between Neanderthals and Denisovans more common, a new study has found.Science
And the fossil of a 90,000-year-old human—found to have a Denisovan father and a Neanderthal mother, according to DNA testing—suggests that sex between the two subspecies was actually quite common. This image shows a model of what a Neanderthal woman might have looked like. Shifts in the Earth's climate made sex between Neanderthals and another ancient human subspecies, Denisovans, more common, a new study has found.Although the two subspecies favored different habitats most of the time—with Denisovans preferring cooler environments, and Neanderthals preferring the warmth—shifts in the Earth's orbit changed the distribution of vegetation, and the overall environment.
The Earth's orbit around the sun determines seasonal fluctuations as well as long-term climate. For example, when the Earth is going through a cycle where it is closer to the sun, we experience a warmer climate.
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