◎◎◎ protein ⪢⪢
_____ is a substance that is necessary for the body to grow and be strong.
http://qindex.info/i.php?x=13535

◎◎◎ concrete ⪢⪢
Concrete is a substance made from stones.
http://qindex.info/i.php?x=13382

◎◎◎ atom ⪢⪢
An atom is the smallest unit of a substance.
http://qindex.info/i.php?x=12207

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