Here's why they're important:
* They help us digest food: They break down complex carbohydrates and other nutrients that our bodies can't digest on their own.
* They protect us from harmful bacteria: They compete for resources and space, making it harder for harmful bacteria to establish themselves.
* They help our immune system develop: They stimulate our immune system, helping it recognize and fight off harmful pathogens.
It's important to remember that most microorganisms are not harmful and actually play a vital role in our health.
