sporopollenin
noun
spo·ro·pol·len·in
ˌspȯr-ə-ˈpä-lə-nən 
: a relatively chemically inert polymer that makes up the outer layer of pollen grains and some spores
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“Sporopollenin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sporopollenin. Accessed 28 Dec. 2024.
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