Which among the following is a micronutrient ?
APhosphorus
BPotassium
CCalcium
DZinc
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വെള്ളത്തിനടിയിൽ സൂക്ഷിക്കുന്ന മൂലകം?
ആദ്യമായി അതിചാലകത കാണിച്ച മൂലകം ?