C. Earth One of the most notable features of the planet Earth is its substantial atmosphere, composed of nitrogen, oxygen, and water vapor.
(C. Earth; is; its substantial atmosphere, composed of nitrogen, oxygen, and water vapor) (its substantial atmosphere; composed; of nitrogen, oxygen, and water vapor)
C. Earth its substantial atmosphere
is composed
its substantial atmosphere, composed of nitrogen, oxygen, and water vapor
of nitrogen, oxygen, and water vapor