Which is a mixture? a. Red and blue marbles in the same container
b. A tin can that cannot be broken down into Simpler substances
c. A piece of iron reacting chemically with oxygen
d. hydrogen and oxygen atoms forming a molecule

A-Red and blue marbles in the same container.

Explanation:

(Apex)

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be