I was reading through the answer key of question 3 in an AP Biology free response (found here: https://secure-media.collegeboard.org/digitalServices/pdf/ap/ap15_biology_sg.pdf ), and it had this question: "Identify whether morphological data or amino acid sequence data are more likely to accurately represent the true evolutionary relationships among the species, and provide reasoning for your answer." My natural response is that amino acid sequence is more accurate, however, Collegeboard also acknowledged "morphological data" as a valid response. I read Collegeboard's reasoning (posted below), and I do not understand it. Can anyone understand their reasoning (see below)? " Morphological data reasoning: Similar molecular sequences may result in different morphologies. An example of species with similar proteins but different morphology (e.g., chimps and humans). "