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Ponds look green when farm chemicals wash in because they feed:

AFish
BFrogs
CWeeds
DAlgae
Answer & Solution
Correct answer: D. Algae
1. Chemicals act as nutrients. 2. Algae flourish and then die. 3. Decomposers use up the oxygen. _Source: syllabus Science, Chapter 18, Pollution of Air and Water._
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