B is the answer
hope it helped!
<span>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</span>
Answer:
Asthenosphere
Explanation:
It is very ductile and is weak mechanically.
The degree of vertex D is if it is an indegree or outdegree, it is 1 degree in vertex D.
Answer:
a system of choosing areas to be developed for particular purposes, such as houses or shops, when planning a town
