Which statement describes a difference between electromagnetic and mechanical waves? a. mechanical waves cannot be longitudinal, but electromagnetic waves can. b. electromagnetic waves cannot move particles, but mechanical waves can. c. electromagnetic waves do not require a medium, but mechanical waves do. d. mechanical waves do not transfer energy, but electromagnetic waves do.

Electromagnetic waves do not require a medium, but mechanical waves do. (C)

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.