Question: The Omphalos hypothesis is named after the title of an 1857 book written two years before which Charles Darwin book ?
Sentence (from "Omphalos (book)"): The reasoning parallels the reasoning that Gosse chose to explain why Adam (who would have had no mother) had a navel: Though Adam would have had no need of a navel, God gave him one anyway to give him the appearance of having a human ancestry.
Relevant evidence: No