<span>Not only does the central engine of active galaxies and quasars require a black hole, Accretion disk of matter is also needed to provide the energy radiated.
</span>Dust, other stellar debris, and gas that has come near to a black hole<span> but fallen into it yet forms a flattened band of spinning matter around the event horizon called the </span>accretion disk<span> (or </span>disc<span>).</span>
Hint: it can peel paint off of a building over time.
Acid rain became a more public issue in the 1970's due to media attention. Acid rain is harmful to plants and aquatic animals. It is caused by the release of sulfur dioxide into the air by industry.
so your answer would be acid rain
The correct answer is D.) Hunters and Gatherers .
My reason being is because this is how they got their food.
This was there whole living situations.
I really hope that this helps you .