https://www.livescience.com/space/mars/nasa-finds-multi-billion-year-old-coral-on-mars
NASA's Curiosity rover has snapped black and white images of a rock on the Martian surface that looks remarkably like a piece of coral.(http://www.autoadmit.com/thread.php?thread_id=5759672&forum_id=2...id.#49165392)