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there are three steps for evolution of seed
1. origin of heterospory
2. development of integument layer for megasporangia which protect and supply
food.
3. retention of imatuare megaspores in the sporangia.
Wiki User
∙ 12y ago
King Khan
Seeds and Pollen as an Evolutionary Adaptation to Dry Land
After fertilization of the egg, the diploid zygote produces an embryo that will grow into the sporophyte when the seed germinates. Storage tissue to sustain growth of the embryo and a protective coat give seeds their supe
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