Which of the following best describes the wave interference phenomenon known as diffraction? a diffraction is an algebraic method of solving a wave problem involving the difference of fractions b an apparent change in wave frequency and wavelength if either the wave source or wave receptor or both are moving relative to each other c bending, spreading and interference of waves emerging from an opening of some sort d a perception of periodic variations in amplitude whose rate is the difference in frequency of two waves being mixed together.

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.

it would be c. predictability