1. Humans and good bacteria in the mouth – protect against bad microbes - Mutualism, 2. Microbes on human skin – they live there without harm or benefit - Commensalism, 3. Humans hunting animals for food – animals are eaten - Predation, 4. Humans and Plasmodium (malaria parasite) – parasite lives in blood and makes humans sick - Parasitism, 5. Humans and gut bacteria – bacteria help digest food, humans give them a home - Mutualism, 6. Humans and intestinal worms – worms eat our nutrients - Parasitism, 7. Humans and head lice – lice suck blood - Parasitism, 8. Humans and Helicobacter pylori – bacteria can damage the stomach - Parasitism, 9. Bacteria in the intestine helping each other – share nutrients - Mutualism, 10. Humans and ticks – ticks suck blood - Parasitism,

Human relationships

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