College board says I omitted 7 questions in CR?

Hi guys,
I took the sat on October 3rd, 2015. I left pretty confident that I got 800 on critical reading. However, when I checked my score, I only got 700 because it says I omitted 7 questions (I got 2 legitimately incorrect, but I don’t remember omitting anything. I almost never omit.)
Should I get them to review my answer sheet for $55? My score would rise from 2190 to 2290 if they were all fixed. One thing that concerns me is that I don’t remember reading about amoebas? Apparently that was a section. Could it have been experimental?

Thanks!