How many helium atoms does water (H20) contain?
OA) O
B) 1
C) 2
OD) 3
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Ответ:
it's zero
Explanation:
water is composed of hydrogen and oxygen
Ответ:
Viagra, Cialis, and Levitra each contain aromatic rings.
They are all ED pills and come from drug manufacturing laboratories (you said "synthetic").
Explanation: