What are bacteria?
Single-celled organisms (unicellular) that are prokaryotes (no nucleus).
Bacteria are a type of single-celled microorganisms that are found in nearly every environment on Earth. They are the most numerous organisms on the planet, with trillions of them living in the soil, water, air, and within other living organisms, including humans. Bacteria are incredibly diverse in their shapes, sizes, and functions. Some are rod-shaped, others are spiral, and some are even shaped like starfish. Bacteria can carry out various types of metabolic processes, including photosynthesis, fermentation, and respiration. While some species of bacteria are harmless or even beneficial to humans, other types can cause diseases like pneumonia, tuberculosis, and food poisoning.
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