No, not quite what you think. The December issue of Scientific American had an article speculating about the possibility of life having arisen more than once on Earth.
No particular evidence of this, but interesting speculation.
Full article

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At night the stars put on a show for free (Carole King)

Phew, thought I'd been found out.

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"If you think the LHC will create black holes, you might as well believe Hobbits are at the bottom of your garden."- Dr. Mike Inglis
Rovers forever! - ToSeek
"Carl Sagan sent a message to ET,
Neil Armstrong walked in the Sea of Tranquility
Steve Squyers built Spirit and Opportunity
Dan Haylen upchucked in zero gravity." -Brent Simon, The Space Camp Song

It would take an extremely isolated environment, indeed. Any newborn life would instantly be in competition with its already-evolved supersurvivor cousins.

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort

Life may have independently arisen several times in earth's history. Fossil evidence does not rule out this possibility. It is not far fetched that accidently formed self-replicating molecules avoided competing for the same resources for a very long time. The evolutionary tree may have more roots than we suspect.

Im very sceptical. We havent been able to really show that life first evolved on earth the one time so I doubt there were two different genesis events on earth.

If life develops very easily then there would be more roots to the tree of life; but apprently so far the record shows all life on earth emerged from a common ancestry - supposedly.

They talk about this in the article. And yes, any survivors would either have to be very isolated, such as in very extreme environments, or not competitors. For example, they talk about the possibility of a life form that uses arsenic as "we" use phosphorous. It might be found in environments that are high in arsenic and low in phosphorous.

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At night the stars put on a show for free (Carole King)

New life is probably arising was we speak, yet being whipped out by more advanced lifeforms...now, if only we had some evidence of this.

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Fields of Space

LOGIC, n.
The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding.

In the Year 2525.

"One small step for (a) man. One giant leap for mankind".

If an astronaut doesn't need good grammar, niether does you.

Host of Seraphim

Well, just because we can't do it doesn't mean it can't be done. Just look at the research history of, say, fusion reactors to see that. And life being created "very easily" is a slippery term; remember than there were millions of years of random trial-and-error experiments going on over an entire planet's surface, that's far more than any research budget can duplicate.

As for common ancestry, all we've ever seen are the final survivors. We have no idea what, if anything, our microbial ancestors might have outcompeted to get to be the finalists.

__________________
"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort

Dude, it's all in the bible. Just read it and pay your tithe...

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Fields of Space

LOGIC, n.
The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding.

In the Year 2525.

"One small step for (a) man. One giant leap for mankind".

If an astronaut doesn't need good grammar, niether does you.

Host of Seraphim