Originally posted by galveston75
Well they still seem to be bacteria today. Why have they not changed in the millions of years they've existed or if they have it has been very little?
And if evolution does not happen based on need, what is it based on, want or maybe curiosity?
And maybe bigger isn't always better but it sure helps if one is running for his life all the time.
ed ju ck alive. So how could they have done it at anytime in the past and why would they even try?
Why do you fundamentalist constantly pretend not to understand the answers to the questions you ask in this infantile manner. I am sure you must know by now that we did not evolve from any monkey in existence today, but that we share a common ancestor with them.
Our ancestors did not all jump down from the trees and into the grasslands one sunday afternoon. Their habitat was shrinking due to climatic change which allowed grass to dominate huge areas of land that was once dense forest. As this new niche appeared they probably exploited it on an ad hoc basis, over time any mutations that gave an advantage to individuals in terms of exploiting this niche would generally speaking be passed on and permeate through successive generations.
I would imagine most larger life forms evolve and adapt along this niche exploitation model as it would seem to offer the time required for gradual adaptation. If there is evidence for relatively quick bursts of evolutionary change it seems to be tied up with dramatic environmental changes leading to mass extinctions and a much more severe survival of the best adapted scenario.
Bacteria on the other hand owe their success to their ability to adapt over much shorter periods due to their tendency to reproduce themselves really quickly and due to their much simpler structure, and mutate as required over much shorter periods. As for why do they not evolve; they do, they diversify at quite dramatic rates.
As Voidspirit suggested you would be better served reading the views of people who actually Know what they are talking about, but we both know you would not admit to understanding them even if you could, being obtuse to the point of sounding infantile is to good a strategy for pretending black is white, and creationism is true.
Btw life forms of any kind do not decide to actively evolve they simply follow a few basic rules of survival and Sh#####g.