9.Rewrite the sentence adding a non-restrictive element using commas.
The students were excited to
begin working on their
projects finally.

your answer is c) experiments with water vapor showed that elements combine in specific proportions.

the sun warms our planet, and with the moon, creates the tides. the moon orbits the earth and in turn, the earth orbits the sun. because they appear to be the same size in the sky, the sun, earth and moon work together to create eclipses. when the moon is directly in between the earth and sun