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The rest you see – all one billion of them – are bacteria. Oldest of life-forms (for two billion years the only life on earth), they are structurally the simplest, lacking the cell nucleus found in other microbes. Most reproduce by fission. Bacteria are the planet’s most abundant, most varied, most versatile, and most useful organisms – and among its most deadly.
These microbes dwell among us – and within us – in astronomical numbers.
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How do most bacteria multiply?
They spawn.
They multiply by joining.
They lay eggs.
They multiply by dividing.