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(A) The exine of the pollen grain is composed of a highly resistant organic material called $Sporopollenin$.$Sporopollenin$ is one of the most resista

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Sporopollenin

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(A) The exine of the pollen grain is composed of a highly resistant organic material called $Sporopollenin$.$Sporopollenin$ is one of the most resistant organic materials known.It can withstand high temperatures,strong acids,and alkali solutions.No enzyme that degrades $Sporopollenin$ is known to date.Due to this remarkable stability,pollen grains are well-preserved as fossils.

Which of the following has proved helpful in preserving pollen as fossils?

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