Chemosynthetic autotrophic bacteria are essential for the survival of ecosystems because they recycle nutrients such as nitrogen, phosphorus, iron, and sulfur. They achieve this by:

• Oxidizing Inorganic Substances: They obtain energy by oxidizing various inorganic substances like nitrates, nitrites, and ammonia.

• Releasing Energy: The energy released during these chemical reactions is used for their own ATP production rather than relying on sunlight.

• Transformation of Nutrients: For example, nitrifying bacteria convert ammonia into nitrites and nitrates, which are then easily absorbed by plants.

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