With the increase of pH above seven, the availability of the following decreases

Options :
  1. iron
  2. copper
  3. zinc
  4. all the above
Answer and Explanation :-

Answer: Option 4

Explanation:

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We pass through this world but once. Few tragedies can be more extensive than the stunting of life, few injustices deeper than the denial of an opportunity to strive or even to hope, by a limit imposed from without, but falsely identified as lying within.
-Stephen Jay Gould The Mismeasure of Man