Darwin’s abominable mystery
Why do flowering plants appear so suddenly, and nearly modern, in the fossil record?
Summary
Darwin called the sudden appearance and swift diversification of flowering plants an “abominable mystery”; their exact evolutionary history and the cause of that sudden appearance are unresolved.
Source
Open, as listed by Wikipedia · Unsolved problems in biology. Checked 29 Sep 2026.
The status is the source’s. Papex does not decide whether a problem is solved.
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