Give the differences between gymnosperms and angiosperms.

Gymnosperms and angiosperms represent two major evolutionary groups of seed plants with fundamental differences in their reproductive structures and strategies. The most obvious distinction is that gymnosperms produce naked seeds exposed on cone scales or similar structures, while angiosperms produce seeds enclosed within fruits that develop from the ovary wall after fertilization. Gymnosperms lack flowers and instead produce pollen and ovules in separate male and female cones, relying primarily on wind for pollination, whereas angiosperms have evolved flowers with tremendous diversity in color, shape, and scent to attract specific animal pollinators like insects, birds, and bats. Additionally, gymnosperms lack vessels in their xylem tissue (with rare exceptions), having only tracheids for water transport, while angiosperms possess both tracheids and vessel elements, making their water-conducting system more efficient.

Beyond these structural differences, angiosperms exhibit several advanced features that have contributed to their ecological dominance. They undergo double fertilization—a unique process where one sperm fertilizes the egg to form the embryo while another fuses with polar nuclei to form the endosperm, a nutritive tissue that supports embryo development. This is more efficient than the gymnosperm strategy where the female gametophyte stores food before fertilization. Angiosperms also show greater diversity in growth forms, life cycles, and habitats, occupying nearly every terrestrial ecosystem from deserts to rainforests, while gymnosperms are predominantly trees and shrubs most successful in temperate and cold regions. The fruit production in angiosperms facilitates seed dispersal through animals, wind, and water, providing adaptive advantages that help explain why flowering plants comprise about 90% of all plant species today, whereas gymnosperms, though ancient and successful in their own right, represent a much smaller proportion of plant diversity.