posted on Mar, 23 2004 @ 03:03 PM
There have been five mass extinctions on Earth (6 including the one going on right now). Each time many species were killed off, but the survivors
repopulated the planet. From volcanic ocean vents, to antartic Ice, to down town NYC there is life. Single celled to complex humans.
At one point in earth history, the world was dominated by single celled organisms. They evolved, and diverged, and spread into macroscopic plants and
animals. Five time events whiped out most of the large animals, and yet new ones evolved.
Now, on to Mars...
Mars is virtualy the same age as the earth.
Yet we see no signs of forrest from orbit or tracks of large animals in the rover's view.
So for now, there seems to be no sign of macroscopic life on Mars.
Why? If Mars at any point had life, would it not repopulate, reevolve as the earth has so many times in the past.
With all the evidence rolling in on ancient oceans, people start talking about ancient life. But where is that life now?
Mars has resources! It has regions warmer than our antartic, home to penguins and other macroscopic life. It has regions more harsh than deep see
volcanic vents home to tube worms and a huge number of other creatures. It has CO2 and Oxygen in the Air the two main gases of our huge forrest. Why
no macroscopic life?
I see two logical options.
1) Mars is currently in a post extinction phase. All the Macro scopic life recently died off and hasn't had time to reevolve (into
different things, but still complex and macroscopic again).
2) Mars never had any life to start. If it had life millions or billions of years ago when it had oceans, that life should have addapted to its
enviroment by now including macroscopic forms.
And before someone says a constant state of single celled organisms is an option, i'd like to point out that is going beyond the bounds of life as
we know it.
The point is, life as we know it evolves. Be it a bacteria becomming drug resistant or a wolf like creature becoming a whale over millions of years,
life evolves. If there is place to be, an advantage to be had, levolution will work its magic when given enough organisms to start.
Small shrews will grow bigger and faster to out run preditors until they become hoses, horses will gorw longer necks to reach higher leaves until they
are giraffes, and other shrews will grow into lions to eat the girraffes. (Yes, a horrible rendition of possible evolutions, but gets the point
If Mars had oceans with life, at least single celled life, why has it not evolved? Why has it not made that leap the earth has made so many time in
size and complexity of life?
Either Mars has no life, something killed it all in a sweeping and (relativly) fast and final extinction, or, it never had life at all.
[Edited on 24-3-2004 by Quest]