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Probably 4 billion years (out of 4.5 billion total), but the simplest ones don't leave much of a record. ------------------------------------------------------------------------------------------------------------- Simple organic compounds can be seen is space dust in distant nebulae, an are to be found in certain (contrite) meteorites which formed in the planetary nebular from which the earth condensed. Therefore they must have been present on earth as it formed.
What else can I help you with?
How long has the Earth been habitable for living organisms?
The Earth has been habitable for living organisms for about 3.5 billion years.
How long has Earth been habitable for living organisms?
Oh, isn't that a wonderful question! Earth has been habitable for living organisms for billions of years. Our beautiful planet has provided a nurturing home for a wide variety of life forms to thrive and evolve over time. Just imagine all the incredible creatures and landscapes that have existed throughout Earth's long and colorful history.
How long have paramecium been on earth?
Paramecium are single-celled organisms that were first discovered in the 17th century. Scientists believe paramecium have been around since the Earth was formed.
Have all organisms been identified?
No, it is impossible to know all of the organisms on earth.
How long has archaebacteria been on earth?
how long has archaebacteria been on earth? how long has archaebacteria been on earth?
What organisms are thought to have been the first to appear on earth?
bacteria
How long has algae been around?
Algae has been around for more than 3 billion years. It is one of the oldest living organisms on Earth.
How long have mice been on this earth?
they have been on the earth for along time
How long have tardigrades been living on earth?
Tardigrades (also known as water bears or moss piglets) have been on Earth about 600 million years.
How long have unicellular organisms have lived on Earth?
they have lived for up to millions of years
Why the organisms crated in water?
Organisms were first created in the water because the earth's land was never created yet. Water organisms have been the first organisms on earth and it says so in the begining of the bible too. Organisms were created in water because there was no land yet for them to be created on.
How long have frogs been on the earth?
They have been on earth since 190 million years ago.
