[Solved] Which of the following is correct? A)Seed plants are currently the dominant vegetation in the world. B)In cones,the seeds are exposed at maturity and for this reason are said to be "naked." C)The conifers,like all gymnosperms,are an ancient group of plants that reached their greatest diversity during the past geological periods. D)The Wollemi pine (Wollemia nobilis)is literally a "living fossil" E)All of the above are correct. Ethane: A colorless, odorless gas that is a hydrocarbon of the alkane series, used as a fuel and in chemical synthesis. Lewis Structure: A representation that illustrates how atoms in a molecule bond and highlights any unshared electron pairs that might be present. Lewis Structure: A visual diagram that illustrates the bonding between atoms and the lone pairs of electrons in a molecule. Phosphine: A colorless, flammable, and toxic gas with the chemical formula PH3, used in various industrial applications and as a pesticide.