Choose two sentences from the article which support the answer to the previous question. A) Parks can help us understand humanity's relationship to the natural world. B) They are powerful resources offering unique place-based learning opportunities. C) The Park Service has always considered education to be a part of its mission but has focused on it only intermittently. D) New technologies such as the Internet, are creating different and exciting ways of teaching and learning in and about parks. E) Holding a salamander in Congaree Swamp hearing the howl of a gray wolf on Isle Royale, or watching the fall migration of sandhill cranes in Denali can remind us that we are but a part of a large and infinitely complex living system.