Fern life cycle.
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<Li> Sporangia release spores.
<Li> Spore develops into a small, bisexual, photosynthetic gametophyte.
<Li> Gametophyte produces sperm in antheridia and eggs in archegonia.
<Li> Sperm swim to eggs in archegonia.
<Li> Zygote develops into large sporophyte.
<Li> Clusters of sporangia form in sori.
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