Vida microscópica: bacteria

Bacteria are the smallest and most numerous living organisms on Earth, found almost everywhere. They are single-celled and lack a nucleus, making them unique among cells. Bacteria play crucial roles in ecosystems by recycling nutrients and are used in food preparation, such as yogurt. While some bacteria are beneficial, others can cause infections and diseases like tuberculosis. They are also vital for human health, aiding in digestion and medicine production.

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