Question

pollen grains are well-preserved as fossils because of the

Answer 1

Pollen grains has a prominent two-layered wall. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known. ... No enzyme that degrades sporopollenin is so far known. Pollen grains are well-preserved as fossilsbecause of the presence of sporopollenin.