Hi! My name is Zalgo and I am here to help you out today. 1 part of the body would be the appendix. I know this because my little brother had got surgery to get his removed because it got infected, but it isn't a needed body part. Another part would be wisdom teeth and that's a bit of the obvious ones considering we have to get our wisdom teeth removed.
B. Charlie should repeat the caliper test because it does not fit with the other information, and he should start an exercise routine and diet to reduce his body fat