Bacteria are single-celled organisms that have existed for billions of years. They are some of the simplest life forms on earth and can be found almost anywhere, from the air you breathe to the food you eat and in the pool (the water you swim in).
Bacteria are single-celled organisms that have existed for billions of years. They are some of the simplest life forms on earth and can be found almost anywhere, from the air you breathe to the food you eat and in the pool (the water you swim in).