For What Percentage Of Time Has Life Existed On Earth. In geochronology time is generally measured in mya million years ago each unit representing the period of approximately 1000000 years in the pastThe history of Earth is divided into four great eons starting 4540 mya with the formation of the planetEach eon saw the most significant changes in Earths composition climate and life. The median time is six million years ago.
The worst was the third extinction which took place around 250 million years ago and wiped out 96 percent of life on Earth. The prokaryotes including both eubacteria and archaebacteria evolved abotu 38 billion years ago. Hope this answer helps.
The prokaryotes including both eubacteria and archaebacteria evolved abotu 38 billion years ago.
If you give the age of the Earth as 4560000 million years old 456 billion. This is the Precambrian era where first life Prokaryotes bacteria formed. Homo sapiens has existed for around 0005 of the amount of time life has existed on earth and hominids have been around for 016 of the amount of time. More than 99 percent of all species amounting to over five billion species that ever lived on Earth are estimated to be extinct.
