"Little green Martians live only in
? mildewy toilets Martian valleys science fiction stories the Martian volcano Olmpus Mons the Martian atmosphere Martian surface soil .
If we happen to find life inside Mars, most astronomers believe it will probably be ? microscopic gigantic capable of flight a fast running reptile a slow crawling mammal a plant
and not
? intelligent housebroken hostile friendly able to see able to breathe Earth's air ."