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bacteria (plural)

Pronunciation:  bak-tEr-E-uh
Definition :single-celled organisms
Facts: Most bacteria come in three shapes: spiral, rod, or round.

Bacteria have both good and bad effects. They are important in decomposition (breaking down dead things) and food production. They may also cause sickness in plants and animals.

Some bacteria have become resistant to antibiotics, which are drugs used to treat bacterial infections.