[spawr-uh-pol-uh-nin] /ˌspɔr əˈpɒl ə nɪn/
an inert, tough polymer forming the resistant outer coat of a pollen grain or spore.
An organic polymer that is extremely resistant to degradation. Pollen grains and many kinds of spores have a protective outer coating of sporopollenin, which is so durable that microfossils of sporopollenin are found in rocks over 500 million years old.


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