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About half a billion years or so.

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12y ago
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11y ago

billions of years

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Q: How long had earth existed before any life appeared?
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Related questions

When was sky first made?

sky was not made . it existed before there was life on the earth.


What year did Saturn form its rings?

No one knows. Certainly before life existed on earth


Who invent radius of earth?

If you are a believer, then God did but if you are not, then nobody did. The radius of the earth existed and therefore ots radius did before there was any form of life on earth to invent it.


Is life on Earth possible without bacteria?

no because bacteria helps digest our food and it also is one of the main decomposers.


Did any animal existed before dinosaur?

There was absolutely no life on land before the dinosaurs. Every living creature was in the sea before dinosaurs roamed the Earth.


For what fraction of geologic time life has existed on earth for what fraction of geologic time have human existed on the earth?

Approx 1/22500 of it.


For how long were prokaryotes the only kind of life on earth?

Prokaryotes were the only kind of life on earth approximately 2 billion years ago. They existed long before eukaryotes ever came into existence at all.


Life has existed on earth for how long?

Most scientists agree that life on Earth appeared 3.6 billion years ago. The first life forms on the planet were prokaryotes.


How long have germs existed?

since the creation of life on Earth.


What type of life forms existed on earth?

human beings


How many earthquake has Arizona had?

the whole earth has got many earth quakes . it got earth quakes before human life existed so you just cant count the number of earthquakes a place has had


Would life on earth would be possible in the absence of photosynthesis?

Can't, it's a false statement. Live existed for > billion years before photosynthesis.