Can bacteria live in temperatures below zero?

Yes, some bacteria are psychrophilic and can live and reproduce in temperatures below zero degrees Celsius.

Psychrophilic bacteria are a type of extremophile, which are organisms that can survive in extreme environments. Psychrophilic bacteria are found in cold environments such as glaciers, ice caps, and permafrost. They have adapted to these cold temperatures by producing enzymes and proteins that function at low temperatures.

Some psychrophilic bacteria can even survive in temperatures as low as -20 degrees Celsius (-4 degrees Fahrenheit). These bacteria are able to survive in these extreme conditions by producing a type of antifreeze protein that prevents their cells from freezing.