The answer is black holes. I hope this helps
Sphere because of the sun orbit around the solar system
Erosion can be controlled by building terraces. The correct option among all the options that are given in the question is the first option. The building of terraces prevents soil erosion by a good margin. It is mostly done in the hilly regions to stop erosion of soil by rain. I hope the answer helps you.
D) despicable a diversified biological
As of 2014 there are only 33 mega cities in existence.
