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High DDT in birds thins eggshells by disturbing the metabolism of:

ASodium
BIodine
CCopper
DCalcium
Answer & Solution
Correct answer: D. Calcium
1. Eggshells break prematurely. 2. DDT upsets calcium metabolism. 3. Bird populations decline as a result. _Source: syllabus Biology, Chapter 16, Environmental Issues._
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