D. specialization of production
<span> the Pacific ring
of fire is the border of the Pacific oceanic plate. It is called the
ring of fire because that edge is very active and lots of subduction
occurs there causing earthquakes and volcanic eruptions</span>
because it's the main highway of the ancient world.
<h2>
Answer: C) stars in these regions are hidden by interstellar dust grains.</h2>
Explanation:
Some areas of the Milky Way seem dark because those are areas of the galaxy that are hidden by huge columns of interstellar dust that we cannot see through the visible range of the electromagnetic spectrum (which is the range in which our eyes see).
However, to solve this problem, astronomers use telescopes that work in the range of infrared and radio waves, to observe a little more through this intersetelar dust.
