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pollen

The male sex spores of flowering plants. Pollen particles are usually nearly invisible, except in large concentrations, due to their extremely small size. They can survive for hundreds of thousands of years in silty, anaerobic soils, such as mud sediments at the bottom of a lake. When excavated from early human sites, they can be used to reconstruct what the climate was like at the time of the occupations as well as relatively date them.

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