Pollen grains can be preserved as fossils because

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they are made up of sporopollenin

they have variety of architecture

they exhibit a fascinating array of pattern and design

they vary from species to species

answer is C.

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Detailed Solution

The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known. It can withstand high temperatures and strong acids and alkali. No enzyme that degrades sporopollenin is so far known. Pollen grains are well preserved as fossils because of the presence of sporopollenin.

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