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Flowers, the reproductive organs of flowering plants, are the most remarkable feature distinguishing them from other seed plants. Flowers, with their colour and their nectar, attract pollinators, which are mostly insects and birds. 95% of flowering plants in tropical lowlands rely on animals for pollination or dispersal of seeds.[1] Although in general, this is true, it is not true of one great group of angiosperms: the grasses. The reason is not clear, but grasses dominate several of the largest land areas: in North America, Asia, and in Africa. They are all wind-pollinated.

Gymnosperms were and are almost entirely wind-pollinated, but early flowers were probably all insect-pollinated.[2] Some present-day flowering plants are wind-pollinated, but that is a secondary feature.[3]p182

Flowerhttps://en.wikipedia.org/wiki/Flower