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Examples
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Unlike cellular organisms, which are all thought to have had one ancestor, viruses are descended from more than one ancestral strain, so it is unlikely that enough virus-laden meteorites landed to seed the "virosphere" we know today.
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If we find life elsewhere, he adds, the absence of a diverse virosphere could suggest that life on Mars, say, might have originated in panspermia.
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In recent years, scientists have discovered that the world of virus diversity — what they sometimes call the virosphere — is unimaginably vast.
Welcome to the Virosphere By 2020
qroqqa commented on the word virosphere
Researchers started exploring the size and diversity of the viral world, or "virosphere", by taking samples from different environments and counting the viruses.
—New Scientist, 30 August 2008
August 30, 2008