Syntrophy is an association between two organisms in which
a) one organism gives off antagonistic substances to prevent the growth of the other
b) one of the organisms relies on the waste products of the other for energy or nutrients
c) they cooperate to break down a nutrient neither could break down alone
d) one benefits while the other is harmed
Answer: b) one of the organisms relies on the waste products of the other for energy or nutrients
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