Question

what was an \abominable mystery\ to darwin?
o the origin of angiosperms
o the anatomy of angiosperms
o the taxonomic organization of angiosperms
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Explanation:

Charles Darwin referred to the sudden appearance and rapid diversification of angiosperms in the fossil record as an "abominable mystery" because it seemed to conflict with his ideas about gradual evolution.

Answer:

The origin of angiosperms