The Sumerians in Mesopotamia are thought to have invented writing around 5,000 years ago.
because it is easier
Because it was before the development of writing, and there are no records.
Most scientists probably don't think anything about hieroglyphics. Historians know that they are a form of pictorial writing used by the ancient Egyptians.
the Sumerians invented the writing cuneiform.
If you are a Creationist the answer is God, if not then the answer is they just exist. or scientists found them and put it into the periotic table. Scientists may have discovered them, they certainly didn't invent them, and I think you mean the periodic table of elements.
Since glass was invented, the scientists were able to create the microscope. If this was never invented, the scientists would never have been able to discover cells.
Since glass was invented, the scientists were able to create the microscope. If this was never invented, the scientists would never have been able to discover cells.
An engineer, Igor Sikorski, invented the helicopter.
The Roman writing invented in the 7th century. This is considered to be among some of the most ancient forms of writing.
Alphabetic writing.
I don't exactly know but I think Leeuwenhoek invented the microscope.
The scientists think that Europa can have the life on it.