(will give brainliest answer)
newton's 2nd law says that acceleration is proportional to the unbalanced force put on an object. (f = ma) in plain english, this means:

a. if you double the force, the acceleration will double too.

b. if you double the force, the acceleration will decrease to half.

c. if you double the force, the acceleration will triple.

no link

explanation:

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.