Deinococcus radiodurans has been listed as the world’s toughest bacterium in The Guinness Book of World Records because of its extraordinary resistance to extreme conditions. It is the most radioresistant organism known to science and is able to rapidly repair damage to its genome. Many question how such a resilient bacterium could evolve on Earth, and some have suggested that the organism is actually of Martian origin. How do they propose the bacterium came to this planet? Discuss