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.
Overview and Timeline. The civilization of Ancient Egypt was one of the earliest in world history. It is usually held to have begun around 3000 BC, when the lower Nile Valley became unified under a single ruler.ncient Egypt in World History. The clearest evidence for the legacy of Ancient Egypt can be seen in architecture. The later Egyptian temples look very similar to early Greek temples; and it has been suggested that the Ancient Greeks got the very idea of monumental building in stone from the Egyptians.