Question 21 of 25 Which statement describes a question that can guide the design of a
scientific investigation?
O A. It asks about how the observations will be organized.
O B. It asks about whether a controlled variable is necessary.
C. It asks about a cause-and-effect relationship between two
variables.
D. It asks about the preferred outcome of the investigation.

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.

wavelength divides in half and speed stays the same.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2