Symbiosis and other ecological relationships

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What is symbiosis?

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A close ecological relationship between two or more different species.

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What is mutualism?

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A type of symbiotic relationship where both organisms benefit.

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What is parasitism?

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A type of symbiotic relationship where one organism benefits at the expense of another.

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What is commensalism?

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A type of symbiotic relationship where one organism benefits and the other is neither helped nor harmed.

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What is competition in ecology?

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The struggle between organisms for the same limited resources.

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What is a predator?

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An organism that eats another organism.

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What is prey?

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An organism that is eaten by another organism.

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How does predation affect population size?

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Predation helps control the population size of prey species.

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What is an example of mutualism?

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Ants protecting aphids in exchange for sugary secretions from the aphids.

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What is an example of parasitism?

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Fish lice feeding on the blood of fish.