2Mg + O2 > 2MgO in the equation above , how many atoms are in the oxygen molecule

A.2

B.0

C.1

D.3

Some of her  assignments would be creation of drugs. she is a medical chemist after all so she'd need to have the necessary knowledge to make medicine which can later be sold in a pharmacy 

D.) domain, kingdom, phylum, class, order, family, genus then species

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