18. “Why have we found only 1 “Lucy”, when we have found more than 1 of everything else?”
Have you noticed how both 18 and 12, who makes essentially the same point about there being only one Lucy (ie, fossil hominid skeleton), both finish with a squiggle?
No-one else feels the need to bolster their argument with a graphical flourish. Perhaps it’s an unconscious attempt to compensate for its obvious weaknesses.