Pollution is:
Correct answer: A. Always an unfavourble alteration
- A. Always an unfavourble alteration
- B. Always a favourable change
- C. Rarely a favoruable alteration
- D. Usually an unfavourable change
Explanation
Pollution is conventionally defined as an undesirable or unfavourable change in the physical, chemical or biological characteristics of the environment. “Always” is stronger than necessary in modern usage, but option a matches the standard textbook definition better than the other choices.
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