Ascienlist wants to identify a wave as mechanical or electromagnetic. Which medium should the wave be sent through to identify it? A
air
B
glass
С
metal
D
vacuum

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

The nationalists army held a higher advantage because of the ammount of men in the army. outnumbered them up to 3 over 1.