Which of the following statements is true regarding bacteria?

The statement that most bacteria are harmless or helpful is accurate because many bacteria play a crucial role in various ecological systems, including human health. For instance, the human gut is home to trillions of bacteria that aid in digestion and help maintain a healthy immune system. These beneficial bacteria are essential for breaking down food, synthesizing vitamins, and inhibiting the growth of harmful pathogens.

In food production, certain bacteria are used in fermentation processes—such as those that produce yogurt, cheese, and other fermented foods—which not only preserve food but also enhance its nutritional value. Thus, the majority of bacteria found in nature are either neutral or beneficial to humans, making this statement true.

Statements suggesting that all bacteria are harmful, that bacteria cannot be found in food, or that all bacteria are pathogenic do not reflect the reality of the diverse roles bacteria play, many of which are positive or essential.