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In Pteris, a fern belonging to the Pteridophyta, the development of the gametophyte begins with the germination of a haploid spore produced by meiosis in the sporophyte. The spore is unicellular and contains a single nucleus. Upon finding a suitable moist environment, the spore absorbs water and ___ _______ _______ ________ ________ ____ _____ _________ _____ ___.
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