7.3 Symbiotic Relationships — KEY for Multiple Choice

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Last updated 9:46 PM on 4/1/26
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5 Terms

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Mutualism

Both species BENEFIT (+/+). Example: clownfish and sea anemone; bees and flowers.

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Commensalism

One species benefits, the other is UNAFFECTED (+/0). Example: barnacles on a whale.

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Parasitism

One species benefits (parasite), the other is HARMED (+/−). Example: ticks on a dog; tapeworms in intestines.

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Predation

One organism (predator) hunts and kills another (prey) for food. Controls population sizes.

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Competition

Two species compete for the same limited resource (food, water, territory). Usually both are negatively affected.