They are the most advanced of the plant kingdom. Advanced adaptations include their vascular system and the flower.
Seeds vary in size form very small to large.
The primary dispersal agent is the seed and depending upon the flower, they may be dispersed as seeds or part of the fruit. The two subclasses of Anthophyta are Dicotyledonae and Monocotyledonae. The cotyledon is the seed leaf, or one pair of leaves, of the embryo plant. The angiosperms are separated into monocots and dicots by the number of seed leaves or cotyledons. Monocots have one cotyledon and dicots have two cotyledons.