Bacteria begin to colonise the gut soon after birth, they play a key role in training the immune system to recognise pathogenic and non-pathogenic bacteria. Just having the bacteria there prevents other pathogenic species from taking up the same space and so prevents some diseases. They also produce some vitamins notably biotin and vitamin K and some ferment carbohydrate foods which we could not other wise digest turning them in to short chain fatty acids.
Harmful bacteria can cause food poisoning, vomiting and or diarrhea.
They are killed by acids and enzymes.
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Bacteria are helpful to us in many ways. One way is by helping us digest our food. They also make vitamins in our digestive tract. They also help make our food by fermenting it, like cheese.
Yes, there are several strains of bacteria that colonize the digestive tract and the skin that are needed. In both the digestive tract and skin these bacteria prevent the formation of colonies of harmful bacteria or fungi. If antibiotics used to treat some bacterial illness wipe out the bacteria that do this fungal infections are particularly common. Certain strains of bacteria in the digestive tract help digest parts of foods we normally can't digest ourselves (e.g. some complex carbohydrates) or make vitamins that we need but are not common enough in foods. Humans and these strains of bacteria are symbiotic organisms.
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An Ant lions digestive tract does not have an opening for waste. The waste can accumulate for over three years in the larval stage. The accumulated wasted is used to make silk for the pupae stage.