What are the spiral arms of the milky way made of?

a. older stars and comets
b. variable stars
c. asteroids and comets
d. younger stars and gaseous nebulae

the spiral arms of the milky way was made of: D. younger stars and gaseous nebulae The spiral arms of the mily way was organized into four spiral arms, and since it was made of younger stars and gaseous nebulae, Spiral arms typically contain a higher density of interstellar gas and dust than the Galactic average as well as a greater concentration of star formation

Early in the story when tom finds an indian skull in the woods which he kicks in temper. the devil then makes his appearance and, as tom surveys him, he notices that the devil is neither "negro" nor "indian." in fact, he has a "swarthy" complexion and is "begrimed with soot."