give one word answer fast
tiny seed like structures with thick walls that remain dormant for a very long time
Paleontological studies use fossil pollen because A. Pollen retains viability for long periods of time unlike male gametes in animals B. The intine of pollen is very hard and stable and can be used in rescuing plant populations on a decline C. The exine of pollen retains its structure for long periods of time D. Soil pollen banks, unlike soil seed banks, stay dormant for long periods of time
Capillaries have very thick walls.