I don't understand why D is incorrect. So we are trying to explain why these canaries go through this yearly process of losing their neurons and then replacing them with new ones and the author claims that it's so that these canary brains don't get so huge ...
Can anyone explain why S3 Q24 on PT 93 is B and not C? I know C has the conclusion less clearly delineated but other than that it seems to match up slightly better.