D prevents repeating. experiments have to be repeated to be reliable.
<span>Are pollution can cause acid rain and the acid rain can hurt lots of living things. </span>
The Earth turns on its axis every day; it orbits the sun, just like all the other planets in our Solar System. You can cross out D and A, obviously. Which leaves us with answers B and C. Now, C says that the Earth turns clockwise, which is false; when viewed from space, they determined it turned counter-clockwise, which leaves us with B. Hope this helped
