Q32.19: among the fission products that may be extracted chemically from the spent fuel of a nuclear reactor is 90sr (half-life 29 y). by its radioactivity, this isotope generates thermal energy at a rate of 0.93 w/g. what is the effective energy released per decay associated with the decay of a 90sr nucleus

no sign of dia of fuel cell

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.

there are no contact forces mentioned on the list of choices that you've provided.