Question

complete the sentence.
the numerous rings that surround the planet saturn have varying thicknesses and masses, orbit the planet at different distances, and ______________.
rotate at different speeds
at different speeds

Explanation:

To complete the sentence, we need a verb - phrase that is parallel in structure to the other verb - phrases in the sentence ("have varying thicknesses and masses", "orbit the planet at different distances"). The first option "rotate at different speeds" contains a verb ("rotate") and is a complete verb - phrase, while the second option "at different speeds" lacks a verb and is not parallel.

Answer:

rotate at different speeds