SAT Subject Biology Practice Question 105: Answer and Explanation

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Question: 105

15. An association between two organisms in which one benefits and neither is harmed is called

A. commensalism
B. mutualism
C. parasitism
D. predation
E. omnivory

Correct Answer: A


Commensalism is a relationship between organisms that has no negative effects on one party but has great benefit for another. An example is moss that grows on trees: the moss obtains a nutrient-rich habitat and can access sunlight, while the tree's function is unaffected by the presence of the moss.

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