1.   It seems most likely, in fact, that primitive life arose and was destroyed several times over by very large impacts.

2.   And some scientists believe primitive life might still exist underground.

3.   Both writers, on entirely different literary levels, were trying to burst through the mannered fog of Victorian society by extolling the virtues of the primitive life.

4.   A discovery of life on Mars, even primitive life in the very distant past, would have profound intellectual and philosophical implications.

5.   But the discovery of possible fossil microbes in a Martian meteorite has raised the possibility that primitive life emerged there about the same time it did on Earth.

6.   Cyanide is a deadly poison to animals, but it was an essential precursor to many of the molecules from which primitive life arose.

7.   If the findings are borne out, they are all the more important in the search for evidence of current or past primitive life on the Red Planet.

8.   Indeed, some scientists believe the speeding mountains of dirty ice known as comets may themselves support primitive life.

9.   Last August, NASA scientists said they believed a meteorite carved from the Martian depths and found in Antarctica harbored compelling signs of primitive life.

10.   Paleolithic-era cave drawings suggest that dance or formal, ritualized movement symbolized everyday activities in primitive life.