Identify the various shapes and structures of pollen grains.
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Pollen grains vary in size, shape, and surface characteristics depending on the plant species (shown below). In general, pollen grains have a double wall consisting of a thin inner wall composed of cellulose, termed the endospore, and a thick outer wall comprised of sporopollenin, termed the exospore
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the shape and the structure of a pollen grains are depend on the plants
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