fill in the blanks .1. the element common to all acids is ___ .2. potassium nitrate is used in ___ .3. __ is needed for a healthy immune system .4. __ is a rich source of iron .t. __ is a complete protein
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Ans1:- Hydrogen
Ans2:fertilizer
Ans3:- Vitamin C,Vitamin D,Zinc,Iron etc
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