In the diagram above, the hydrogen atoms combine with the oxygen atom to form a(n) A
compound.

B
element.

C
atom.

D
ion.

sorry idk the answer well to you i have a explaination

explanation: a formula which shows the arrangement of atoms in the molecule of a compound

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)