1: Researchers say Mars may once have had an sea as extensive as Earth 's Atlantic Ocean , and Curiosity has found evidence of ancient streambeds and a lake on the planet . 2:  Conditions near the surface of present-day Mars are hardly favorable for microbial life as we know it ,  he said ,  but the possibility for liquid brines on Mars has wider implications for habitability and geological water-related processes .  3: The finding has  wider implications  for efforts to find evidence of life on Mars , a researcher says .
1: evidence 2: possibility 3: The finding