14. mixtures are classified as homogeneous and heterogeneous according to
o the states of matter of their components
o the masses of their components
o the distribution of their components
o whether their components are elements or compounds

For the oxyge in your body for it to work

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

C) the increase in atmospheric pressure pushes the walls of the balloon outward thus making it  is the answer.hope i you.