My least favorite bio passage was definitely that evolutionary tree one! (I'm not even sophisticated enough to call it a cladogram!) It took me way too long to get through! I had totally forgotten about that athlete/nonathlete breathing rate passage until GTV brought it up! I think at that point, I felt so screwed by the test anyway, that that passage felt par for the course. But yes, I thought it was tricky, too. seemed more reading comprehensiony to me than anything else.
OH something that totally SUCKED during the test was that after I thought I was done, I'd hit review, only to see that I had missed the last question of passage 2 or 3 or something cuz I didn't scroll down all the way. Thankfully, I got to those in the end, but not seeing them the first time I read the passage totally threw me off because a) it freaked me out and b) I didn't exactly have time to reread the whole passage again, so I had to go by memory. EEEK!!
I kind of don't even want to know my score anymore... 🙁