Bacteria in the human digestive system
Lesson 5 / 5
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I can describe the important roles of bacteria in the human digestive system.
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Bacteria are living organisms; each bacterium is a microorganism made of a single living cell.
Some bacteria are pathogens that cause diseases, but many bacteria are harmless and some are helpful.
Helpful bacteria live inside the human digestive system.
They release enzymes that digest food we cannot digest ourselves.
They also help to protect us against pathogens that enter the digestive system by competing against them.
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