Bacteria (singular: bacterium) are a major group of living organisms.
Most are microscopic and unicellular, with a relatively simple cell structure lacking a cell nucleus, and organelles such as mitochondria and chloroplasts.Bacteria are the most abundant of all organisms.
Many pathogens, disease-causing organisms, are bacteria.
For more information about the topic Bacteria, read the full article at Wikipedia.org, or see the following related articles:
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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