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    Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats.

    Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep portions of Earth's crust.

    There are approximately 39 trillion bacterial cells in the human microbiota as personified by a "reference" 70 kg male 170 cm tall, whereas there are 30 trillion human cells in the body.

    This means that although they do have the upper hand in actual numbers, it is only by 30%, and not 900%.

    Bacterial cells are about one-tenth the size of eukaryotic cells and are typically 0.5–5.0 micrometres in length.

    The nutrient cycle includes the decomposition of dead bodies and bacteria are responsible for the putrefaction stage in this process.Bacteria also live in symbiotic and parasitic relationships with plants and animals.Most bacteria have not been characterised, and only about half of the bacterial phyla have species that can be grown in the laboratory.Many bacterial species exist simply as single cells, others associate in characteristic patterns: Neisseria form diploids (pairs), Streptococcus form chains, and Staphylococcus group together in "bunch of grapes" clusters.Bacteria can also group to form larger multicellular structures, such as the elongated filaments of Actinobacteria, the aggregates of Myxobacteria, and the complex hyphae of Streptomyces.

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