1 The periodic table of the elements - Dmitri Mendeleev - 1869This Russian chemist organised all of the chemical 1)into groups based on their 2) and left spaces for newelements to be discovered. This information is known as the periodictable of the elements and is used all over the world.2The Big Bang Theory - Georges Lemaître - 1920sA Belgian physicist and astronomer was the first to suggest that our3) is expanding from a single point. His ideas becameknown as the Big Bang Theory which is one theory for how theuniverse was created.3DNA structure - James Watson & Francis Crick - 1953s?American scientist James Watson and British scientist Francis Crickdiscovered that our 4) is not flat, but a 3D structure thattwists around in a double-5​ .ОТВЕТ1)proper2) elements 3)DNA4)universe 5)helix