Which atoms could join together to form a molecule of an element?
This chart shows four atoms, labeled W, X, Y, and Z.
These atoms can combine with each other to form
molecules.
O W and X
O X and Y
O W and Z
O Y and Z
Atom
w
Х
Y
Z
Element
oxygen
hydrogen
carbon
oxygen

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

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest