Round off 3.647
correct two decimal places
correct the nearest whole number​

Explanation:

Rounding off 3.647 to 2d.p (2 decimal places)

= 3.65(please use the curly equal)

Rounding off 3.647 to whole number

= 4 (Same thing, since 3.6 is more than 3.5)

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.