Prehistory of Siberia Siberia were hunter-gatherers, whose prey consisted of mammoths and reindeer, and occasionally fish as well. In the 6th millennium BC, pottery spread across the whole of Siberia, which scholars treat as the beginning of the Siberian neolithic. Unlike Europe and the Near East, this event did not mark a major change in lifestyle, economy or culture. The prehistoric inhabitants of the vast areas of taiga and tundra east of the Yenissei and north of Baikal differ in many ways from the prehistoric cultures of the other parts of north Asia. There is stronger evidence than usual for settlement continuity here
Evolution of the eye narrow range of wavelengths on the electromagnetic spectrum—the visible spectrum—is because the earliest species to develop photosensitivity were aquatic, and only two specific wavelength ranges of electromagnetic radiation, blue and green visible light, can travel through water. This same light-filtering property of water also influenced the photosensitivity of plants. In a lensless eye, the light emanating from a distant point hits the back of the eye with about the same size as the eye's aperture. With the addition of a lens this incoming light is concentrated on a smaller surface area, without reducing the overall intensity of the stimulus. The