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In plants, alternation of generations refers to the life cycle in which two distinct multicellular phases—the haploid gametophyte and the diploid sporophyte—alternate with each other. These generations can be either isomorphic, where the gametophyte and sporophyte are morphologically similar, or heteromorphic, where they are distinctly different in appearance and structure. In isomorphic alternation of generations, both gametophyte and sporophyte resemble each other in shape and size, making it difficult to distinguish between the two just by external morphology. This type is commonly observed in lower plants such as some algae, including *Ulva* (sea lettuce) and *Cladophora*. In *Ulva*, the thallus of the gametophyte (haploid, n) is similar to ___ _______ ____ __________ ______ ______.
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