<human>:  Why do plants have flowers?
<bot>: Flowers are the reproductive organs of plants. They are adapted to attract pollinators. Flowers evolved from other structures in plants, such as the ovules of ferns, the seeds of conifers, and the cones of gymnosperms. The earliest flowers were probably small and inconspicuous. The first flowers evolved in the Paleozoic Era, and they were likely pollinated by insects.