The Earth was first considered habitable when we discovered that it was Microbial organisms that started the process. I would go with D.
<span>Vector control and Drug therapy are two other methods for controlling viral diseases. </span>
So sound travels 1 kilometer in roughly 3 seconds and 1 mile in roughly 5 seconds. When you see the flash of a lightning bolt, you can start counting seconds and then divide to see how far away the lightning struck.
On edge the answer is similar size, mass, and density.
