11.   Scientists believe that all life may have originated in some great prehistoric molecular stew.

12.   That clue fit well with new ideas holding that life originated at volcanolike temperatures.

13.   That supports the view that life originated in such places, a theory that a self-taught German chemist has been promoting for several years.

14.   The archaea are an ancient group of bacteria-like organisms found in the hottest places on earth, a possible hint as to where life may have originated.

15.   There are those who argue passionately that life originated with a single replicated molecule.

16.   They put forward the controversial suggestion that life on Earth originated when such bacteria arrived from space.

17.   What is the religious significance of the discovery that life did not originate on Earth or, perhaps, that life is common throughout the universe?

18.   Russian and American scientists are joining efforts to look into evidence that life may have originated on planets other than Earth, a researcher said Wednesday.