Question

Which is a unique feature of Mercury?

A.
It is the smallest planet and has the shortest period of revolution around the sun.

B.
The thick atmosphere—made mostly of carbon dioxide—absorbs solar radiation, heating up and helping make the atmosphere very hot.

C.
The planet’s surface is covered with red, iron-oxide dust.

D.
It is the only planet with permanent liquid w

Answer 1

it's b i think

Answer 2

thanks d was cut off this is the rest water on its surface.

Answer 3

its A