A mutually beneficial relationship exists between the human intestine and many of its symbionts: the human intestine provides nutrients to the resident bacteria, whereas bacteria aid in the digestion of food and absorption of nutrients, produce vitamins such as biotin and vitamin K, regulate immune system function,
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B. Parasitism
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A mutually beneficial relationship exists between the human intestine and many of its symbionts: the human intestine provides nutrients to the resident bacteria, whereas bacteria aid in the digestion of food and absorption of nutrients, produce vitamins such as biotin and vitamin K, regulate immune system function,