What structural features of seeds and fruits of angiosperms gave them advantages over gymnosperms?

1) the presence of juicy fruits, fruits with hooks, etc. allowed to expand the available distribution methods
2) triploid endosperm, in comparison with haploid, allows you to store more nutrients and ensure faster germination
3) the development of the fetus inside the flower (closed) reduces the likelihood of death of the embryo and the fetus in the process of maturation

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