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Which of the following elements is non-radioactive?

A. Uranium

B. Plutonium

C. Thorium

D. Zirconium

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  20. Pollination by birds is called
  21. The speed of light with the rise in the temperature of the medium
  22. The fastest acting enzyme in the biological kingdom is
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  25. Epoxy resins is used as
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