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Unit 6 · Nature and Environment

Interaction Between Living Beings Presentation

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Science and Technology, Class 9

Interaction Between Living Beings

Unit 6 · Five kinds of interaction

The Five Main Interactions

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Mutualism: both gain

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Commensalism: one gains, the other is unaffected

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Parasitism: the parasite gains, the host is harmed

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Competition: struggle for the same resource

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Predation: kill and eat

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Presenter notes: Before starting, ask the class whether humans could survive in a place with no other living beings at all. Use their answers to reach the idea that organisms depend on one another.