Grass
The first instrument known to mankind, is the human voice.
Satan.
He was the first mandingo known to mankind
there are thousands of them that are known to mankind.
Wrestling was an event at the first Olympic games. It can be argued that wrestling is the oldest sport known to mankind.
Mesopotamia, which means "land between the rivers" is located between the Tigris and Euphrates Rivers.
It can never be known. Certainly hundreds of millions of years before the onset of mankind.
The plant help mankind by purifying the air by absorbing CO2 and releasing O2 during synthesis of organic compounds used by entire animal kingdom including mankind.
The first known machine was "The Wheel". The first invention, which helped mankind in many ways, from transporting masses to travel.
The first known machine was "The Wheel". The first invention, which helped mankind in many ways, from transporting masses to travel.
Mankind has known about (and hunted) animals since the dawn of Human time.
Jupiter is visible to the naked eye. It has been known since mankind first started stargazing.