1. Bacteria act in bioremediation. They are utilized as a solution for pollution.
2. Bacteria act as decomposers. They recycle dead organic matter in order not to pile up in the environment.
3. Bacteria are used to make food such as dairy products.
4. Prochlorococcus are certain type of bacteria responsible for converting CO2 to O2 in photosynthesis.
5. Certain vitamins are being produced by gut bacteria such as Vitamin K.
6. Bacteria are utilized to produce medications such as antibiotics and vaccine.
All Options are correct.