Question

Бактерии. Вред или польза?

Answer 1

И то, и то.
Бактерии используют в продуктах питания, чтобы они быстро не портились. 
Но и, конечно же, болезнетворные бактерии, которые отрицательно влияют на внутреннюю систему живого организма. 

Answer 2

Bacteria: Harm or Benefit?

Bacteria are a diverse group of microorganisms that can be found in various environments, including soil, water, and the human body. They can have both harmful and beneficial effects on living organisms, including humans.

Harmful Effects of Bacteria: 1. Infectious Diseases: Certain bacteria can cause infectious diseases in humans, such as pneumonia, tuberculosis, and urinary tract infections. 2. Foodborne Illnesses: Some bacteria, like Salmonella and E. coli, can contaminate food and cause food poisoning when consumed. 3. Dental Issues: Bacteria in the mouth can contribute to dental problems, including tooth decay and gum disease. 4. Antibiotic Resistance: Overuse and misuse of antibiotics can lead to the development of antibiotic-resistant bacteria, making it more difficult to treat bacterial infections.

Beneficial Effects of Bacteria: 1. Digestion and Nutrient Absorption: Bacteria in the gut play a crucial role in digestion and the absorption of nutrients from food. 2. Synthesis of Vitamins: Certain bacteria in the gut can produce vitamins, such as vitamin K and some B vitamins, which are essential for human health. 3. Immune System Development: Exposure to certain bacteria early in life helps in the development and maturation of the immune system. 4. Environmental Benefits: Bacteria play a vital role in nutrient cycling, decomposition, and soil fertility, contributing to the health of ecosystems.

It's important to note that the effects of bacteria can vary depending on the specific species and context. While some bacteria can be harmful, many others are beneficial or even essential for various biological processes.