Angiosperms are dioecious; pines are not.
Angiosperms use a pollen tube to deliver sperm to the egg; pines do not.
The tissue surrounding the embryo is triploid in angiosperms; it is diploid in pines.
The megaspore mother cell is diploid in angiosperms; it is haploid in pines.
Microspores are produced by meiosis in angiosperms; they are produced by mitosis in pines.
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