Pollen grains of flowering plants are protected because of a stable, rot-resistant outer rind.

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"The outer rind that carries [pollen grains] is composed of a substance so stable and so resistant to rotting that it may survive for tens of thousands of years and still be recognisable." (Attenborough 1995:95)

The Private Life of PlantsBBC BooksAugust 21, 1995
David Attenborough

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