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The microscopic pollen grains of the past are obtained as fossils. Mention the characteristic of the pollen grains that makes it happen.

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The microscopic pollen grains of the past are obtained as fossils. Mention the characteristic of the pollen grains that makes it happen.

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Exine, the outermost hard layer is chemically composed of sporopollenin, which is highly resistant to high temperature, strong acids, alkali and enzymes.

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