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Antibiotics are not effective against cold and flu because these are caused by:

ABacteria
BProtozoa
CMoulds
DViruses
Answer & Solution
Correct answer: D. Viruses
1. Antibiotics kill or stop bacteria. 2. Cold and flu are viral. 3. Unneeded antibiotics reduce future effectiveness. _Source: syllabus Science, Chapter 2, Microorganisms: Friend and Foe._
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