Question

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