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===About Bacteria in Digestion===
: A human gut has about 1kg of [[bacteria]] inside it.
==Key Stage 4==
===Meaning===
The human [[Digestive System|digestive system]] relies on [[bacteria]] to help [[Digestion|digest]] food.
===About Bacteria in Digestion===
: A human gut has about 1kg of [[bacteria]] inside it.
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=1sISguPDlhY}}