PLATE 3 The top photo is a false-color scanning electron micrograph of assorted pollen grains showing how the size, shape, and surface characteristics differ from one species to another. By counting the number of species and their abundance in sediments and peat deposits (called “palynology”), it is possible to analyze how ecosystems and climate have varied over time. The bottom photo shows pollen from Tilia (Linden or Basswood), which is a temperate deciduous species.

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