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  • Rights: Public domain – U.S. Government Published 22 July 2021 Size: 340 KB Referencing Hub media

    Bacteria cells are single-celled organisms – they can live by themselves. This image is of a Campylobacter bacteria – a common cause of diarrhoea and dysentery.

    Bacteria are situated on extreme ends when it comes to numbers. They are really tiny – measured in micrometres (between 10-6 m and 10-7 m), but are really abundant – there are approximately 5 nonillion (5x1030) bacteria on Earth, with around 40 million bacteria in a single gram of soil!

    Image: Public domain – U.S. Government

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