In moving from water to land, ancestral plants overcame many obstacles in order to survive. A. Neither brown nor red algae are likely to be ancestors of plants because of their difference in pigmentation B. The instability of freshwater habitats caused marine algae to develop adaptations to their harsh environment. C. The colonization of land by plants was a major revolution in the history of Earth. D. Terrestrial plants adjusted to life on land by undergoing structural changes that enabled them to support themselves, resist drying, and exchange gases. E. To colonize new terrestrial habitats, plants needed to create a way of reproducing without water. F. Once plants had overcome the challenges posed by terrestrial life, they prospered by becoming less diverse.