Hey there! Great question. The plural of bacteria is actually just "bacteria" - it doesn't change! This is because bacteria is already a plural noun. Think of it like the word "sheep" - you wouldn't say "one sheep, two sheeps," right? It's the same with bacteria.
Now, if you wanted to refer to multiple types of bacteria, you could say "different species of bacteria," or if you wanted to talk about individual bacterial cells, you could use the word "bacterium." But when referring to the concept of multiple bacteria as a whole, it's just "bacteria."
I hope that clears things up! Don't hesitate to ask if you have any more questions.
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