AP BIOLOGY

Detailed explanation-1: -Next to the name of each type of symbiosis are symbols indicating whether the organisms benefit, are harmed, or aren’t affected by the relationship. The symbol for commensalism is (+/0) which means one organism benefits and the other isn’t affected.

Detailed explanation-2: -Correct answer: Commensalism is a relationship in which one organism benefits and the other organism is neither benefited nor harmed. Mutualism is a relationship in which both organisms benefit.

Detailed explanation-3: -In a commensal relationship, one species benefits and there is a neutral effect on the other-it neither benefits nor is harmed. An example of this relationship is birds building nests in trees. The nests don’t interfere with photosynthesis and are light weight, so they don’t put a strain on the trees.