How does a theory differ from a theory

Both of those terms are widely used in higher education, particularly in the sciences.  Their technical definitions, as well as their common underlying meanings, are precisely identical.  So you can use either one without any fear of being corrected or misunderstood.

b.a device that inputs heat into a cool object

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.