The plural form of the word "bacteria" is actually bacteria itself. You see, in English, some words borrowed from Latin or Greek keep their original plural forms. "Bacteria" is one such example - it's the plural of "bacterium". So when you're talking about one, it's "bacterium", and when you're talking about more than one, you use "bacteria". This is a common quirk in language, where some words don't follow the regular 'add an s' rule for plurals. Much like 'sheep' or 'moose', the word stays the same whether you're talking about one or one hundred. Isn't language fascinating?
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