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Are bacteria autotrophs or heterotrophs?
Bacteria belong to autotrophic and heterotrophs. In the case of autotrophs, nitrifying bacteria, iron bacteria and sulfur bacteria belong to autotrophs.

Whether carbon dioxide can be converted into organic matter can be an autotrophic organism, not heterotrophs. For example, plants and cyanobacteria can use light energy to convert carbon dioxide into organic matter through photosynthesis, so they are photoautotrophs.

Nitrifying bacteria can use chemical energy (the bacteria can convert ammonia into nitrate, which will release a lot of chemical energy) to convert carbon dioxide into organic matter. It is an autotrophic organism, and other organisms cannot convert carbon dioxide into organic matter, that is, heterotrophs.

Extended data:

Using sunlight, carbon dioxide in the air, water and inorganic salts in the soil, organic matter is produced through biological processes such as photosynthesis, which provides material and energy for the lives of various organisms in the ecosystem. Producers' materials are transferred to consumers by being consumed by consumers, and at the same time, some energy is transferred.

Autotrophic organisms generally have no digestive function, so they cannot swallow other organisms (such as animals and fungi). Therefore, autotrophs use other methods to maintain life, such as photosynthesis used by plants.

However, plants still need water, visible light and carbon dioxide in the process of photosynthesis, which does not mean that plants are autotrophic biota, because these three conditions are the basic conditions of life.