B. would be the best choice to choose.
Constellations, groups of stars, provide astronomers with a roadmap of the galaxy.
Answer:
groups of stars
Explanation:
Groups of stars is a nonrestrictive <u>appositive phrase</u> that provides additional information about the noun <em>Constellations</em>. It is set off with commas because the information it provides is not necessary for identifying the noun it describes.
My opinion is that they should, because taking a look at the periods of time where we didn't have them and we were all dying from the littlest defect in our immune system, such as a common cold. I do also think that they shouldn't be required in schools and other public places such as jobs.
It makes it more difficult to survive in the Yukon because he isn’t familiar with his surroundings because he is a newcomer.
