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- The three main parts of a typical mature eudicot seed are the _______ . a. pollen grain, egg, and seed coat b. embryo, endosperm, and seed coat c. megaspores, microspores, and ovule d. embryo, cotyledons, and seed coatDescribe the structure of a seed. Include the following: Seed coat, endosperm and embryo.Describe seed germination. Investigate conditions necessary for seed germination. Define seed dispersal. Describe the different modes of seed dispersal. Identify seeds and fruits according to their modes of dispersal.