Here's a corrected version: "Have you ever ran in a relay race? If you can imagine a relay race, then you'll understand how
<span> the Pony Express worked.</span>" Only one main punctuation error.
Charlie is standing inside his home
A pen name used by an author instead of his real name is a pseudonym.
The second paragraph relies from an expert opinion to support the organizations' point of view. It is because this paragraph shows the reason why the amount of ice in the Arctic is decreasing. Professor Peter Wadhams of Cambridge University is shown as an expert. Statistics is also shown as proof which is the IPCC estimate from 2007.