[freepertoo]

And nothing has evolved, huh? Hmmmm. :-)

[fishtank]

Cross contamination from asteroids hitting the earth and the material landing on Mars.

[samtheman]

And nothing has evolved, huh? Hmmmm. :-)

I see your smile there, but I'll take this opportunity to point out to those who would repeat your words seriously: nothing can evolve under the wracking rays of UV that such a thin atmosphere allows.

[MarkL]

And nothing has evolved, huh? Hmmmm. :-)

Image taken from the Viking Lander, just released to the public:

Mark