Conifers bear their reproductive organs in cones rather than flowers. Male cones produce pollen that fertilizes female cones to develop seeds. Conifers are gymnosperms that bear naked seeds, unlike angiosperms whose seeds develop within fruits. Conifers have many uses including timber, resin/turpentine extraction, railway sleepers, paper production, and food. Their timber is strong, durable, and inexpensive. Resins from various conifers have medical uses as antiseptics, diuretics, and treatments for respiratory and skin ailments.