While conditions on Mars are no longer favorable for the evolution of life, scientists point out that in many ways Mars resembles portions of Antarctica, which do manage to support colonies of microbes. But these organisms require liquid water, as do all forms of life. And if there is liquid water on Mars at all, it is only seasonal and in small amounts. The statements above, if true, most strongly support which one of the following? ['If there is life on Mars, then there is liquid water on Mars.', 'If there are colonies of microbes in Antarctica, then there are colonies of microbes on Mars.', 'It is unreasonable to suppose that Mars has ever supported any forms of life.', 'If there is liquid water on Mars, then there are colonies of microbes on Mars.']