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of sporangia, which allowed for the development of two different spore types; numerous small spores that are easily dispersed, and fewer, larger spores that contain adequate resources to support the developing seedling. During the Devonian period there were many species that utilized vertical growth to capture more sunlight. Heterospory and separate sporangia probably evolved in response to competition for light. Disruptive selection within species resulted in there being two separate sexes of gamete or even the whole plant. This may first have

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