Trace the development of female gametophytes in Cycas

In Cycas, a member of the gymnosperms, the development of female gametophytes is a highly intricate and fascinating process that involves several key stages. The life cycle of Cycas alternates between the diploid sporophyte generation and the haploid gametophyte generation, with the latter playing a crucial role in reproduction. Female gametophytes in Cycas, like other gymnosperms, develop within the ovules, which are housed in the cones. 

The female gametophyte of Cycas originates from a single functional megaspore produced within the ovule. This megaspore is produced through meiosis in the megasporangium, ____ _________ ________ _____ ____ ____ ____.
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