Consider the following:

I. the speed of the observer;
II. the speed of the source;
III. the loudness of the sound.

In the Doppler effect for sound waves, which factors affect the frequency that the observer hears?

1. B only
2. None of these
3. C only
4. A only
5. A, B, and C
6. A and C only
7. B and C only
8. A and B only

I think it's 3 c only the loudness of the sound

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.

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