It was one of many questions year 12 pupils faced during the NCEA level 2 biology examination yesterday.
And for the 41 Logan Park High School pupils leaving the exam at the finish, their responses ranged from "It was all right" to "Oh my God, what on Earth was that?".
The general feeling was the paper was much harder than the "practice papers" from previous exams.
Biology level 2 was one of the first exams in the 2008 NCEA exam season, which began yesterday morning.
Otago's 6335 candidates are among more than 139,000 senior secondary school pupils nationwide sitting NCEA exams this year, filling out nearly 1.9 million answer booklets.
This year's largest exam sessions will be today's level 1 English (46,755 candidates) and Monday's level 1 mathematics (44,556 candidates).
The smallest is scholarship Latin, with 19 candidates.
The New Zealand Qualifications Authority plans to publish exam papers online by the end of the following business day after each exam.
Candidates will receive their NCEA results by mid January and NZ Scholarship results in mid-February.
Marked NCEA exam papers will be returned to candidates from the end of January.
