3.8 billion years
Life on Earth is estimated to have existed for around 3.5 billion years. This means that life has been present on Earth for a vast majority of its 24-hour "day."
W-O-W. Let's think here: If there was no food, there would be no life. Using that logic, I'm guess that there has been food on Earth as long there has been life on Earth. That answer should change depending on your religion.
how long has archaebacteria been on earth? how long has archaebacteria been on earth?
Life it ubiquitous on and in the Earth. Earth has been terraformed by the biosphere.
Life has been on this planet for over three billion years. Life on Earth will continue after mankind's reign is over.
forever it was on earth when the earth was made
they have been on the earth for along time
The probability is 1, since it has already happened. There has been life on earth for millions of years - long before humans.
The Earth is about 4.5 billion years old. Life appeared on Earth about 3.5 billion years ago. The Earth would have been about 1 billion years old at that time.
earthworms were the third form of life. They have been around for over 2000 years.
ATP has been used as long as there have been living things on Earth. It developed with the earliest anaerobic prokaryotic cellular life. Probably slightly more than 3 billion years, not long after the crust of the Earth first began to solidify and liquid water became available.
As of now, no non carbon-based life forms have been found on Earth. All known life on Earth is carbon-based.