In Environment A, trees are growing back and some of the larger animals are returning to a logged forest. In Environment B, lichens and moss are growing on a rocky mountainside that was scraped bare as a glacier retreated. Now, hundreds of years later, some small grasses, shrubs, and animals live there. Which statement best describes both situations? Environment A is undergoing succession, and Environment B is not. Environment A is not undergoing succession, and Environment B is. Both environments are undergoing the same kind of succession. Both environments are undergoing succession, but different kinds.