Diatomic molecules are molecules composed only of two atom s, of either the same or different chemical element s. The prefix di-means two in Greek. Common diatomic molecules are hydrogen (H 2), nitrogen (N 2), oxygen (O 2), and carbon monoxide (CO).he bond in a homonuclear diatomic molecule is non-polar and covalent. In most diatomic molecules, the elements are nonidentical. Prominent examples include carbon monoxide, nitric oxide, and hydrogen chloride, but other important examples include MgO and NaCl.
Africa, which developed the world's oldest human civilization, gave humanity the use of fire a million and half to two million years ago. It is the home of the first tools, astronomy, jewelry, fishing, mathematics, crops, art, use of pigments, cutting and other pointed instruments and animal domestication.In short Africa gave the world human civilization.illions of years ago human life started in Africa, Australopithecus aphaeresis and Australopithecus africanus and Australopithecus robustus were all key rungs in the development of humanity.
Nubia. Civilization in Sub-Saharan Africa began in the land of Nubia, which denotes the region around the segment of the Nile River in northern Sudan and southernmost Egypt. Nubia was the southern neighbour of ancient Egypt, whose territory also lay along the banks of the Nile (see History of the Ancient Middle East).ubian merchants acted as middlemen in Egyptian trade with Sub-Saharan Africa, and Nubian warriors often served as mercenaries in the Egyptian army. 23. Nubian civilization was born ca. 2000 BC, with the rise of the city of Kerma (the first Sub-Saharan city).