11.   Researchers from the California Institute of Technology offered new support Thursday for the claim by NASA scientists that a meteorite holds fossil evidence of primitive Martian life.

12.   Reports that water may have flowed on Mars bring closer the answer to the much more tantalizing question of whether some form of primitive life may have developed there.

13.   Scientists have yet to prove the existence of even primitive life beyond the Earth, though neighboring Mars is a leading candidate.

14.   Some scientists, as surely you know by now, believe new evidence indicates there once was some kind of primitive life on Mars.

15.   The encounter with the Jovian moon will occur more than four months after scientists announced their discovery of evidence that primitive life once may have existed on Mars.

16.   The hints of fossil microbes found in martian meteorites suggest that about the time primitive life began on Earth, it may have appeared on Mars too.

17.   The Jason expeditions have explored a Roman ship in the Mediterranean, geysers in the Sea of Cortes and primitive life near the Galapagos Islands.

18.   The narrator makes a strained segue from primitive life to an obsession with death as evidenced by the ancient sarcophagus discovered not long ago near the pyramids of Giza.

19.   There is a temptation to make light of the claim that evidence of primitive microscopic life has been detected in a rock that fell from Mars.

20.   Willoughby said he felt sorry for the Oliphants, with their primitive life among goats, chickens, peacocks, rabbits and lambs.