Which of the following is NOT a pur substance A.) milk B.) oxygen C.) water D.) carbon dioxide

milk

Explanation:

it is not a pure substance

milk does is a colloid

oxygen is an element and H20 and CO2 are compounds so they are pure

terd muffin is the correct answer

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.