I think its C building a barrier wall
Sometimes (EX:<span> HCl is a covalent substance, however, when it is dissolved it is ionized to form hydrochloric acid).</span>
I would say yes, a magnetic reversal a threat to life on Earth. Base on articles, it is the end of the world if that happens. <span>Some people believe global cataclysm will occur when Earth's magnetic poles reverse. When north goes south, they say, the continents will lurch in one direction or the other, triggering massive earthquakes, rapid climate change and species extinctions.</span>
Because the mouth breaks down the food and the stomach uses acid to break food down even more
260 meters im pretty sure because rate*time=distance