Ethos, because this advertisement is using appeal. It is stating that it is more reliable and honest as to where pathos appeals to emotion and there is no emotion in this. And logos is an appeal to logic or reason, giving details and facts of the product, where as, this statement you have has nothing more than a simple statistic of how many uses it, but not what it contains or does to help.
The resulting error inch would be three inches. This is all correct bc i checked in my book
They use the process of photosynthesis for energy and only in the upper 100 ft the sun can produce light into the bodies of water and the phytoplankton then use that light and use the process and convert it for their energy