Missing link found , darwing was RIGHT!! NOT :P
 

you already know what I think
antibiotic resistance is a clear proof of evolution. "a change in the enviroment(I insist on this point, without a drastic change in the enviroment and without something horrible happening, evolution doesn't happen) will cause only the fit to survive and the less fortunate to die, eventualy leading to a formation of a whole new specie"

in microbes and antibiotics, your body is the garden of eden for bacteria(jannet 3adan, God's heaven for bacterias is your body), it is filled with bacteria(most being harmless)when you take an antibiotics the antibiotics kills all the bacterias and not only the one causing the disease, the minority of the bacteria who were able to survive the antibiotic attack(maybe 0.01% of the bacterias were normaly resistant) will be left alone in your body with all the food and space to fill all by themselves

80 years ago penicillin(the first antibiotic was invented) it used to cure alot of diseases very effectivly, now 80 years later the diseases that were cured back then are no longer curable now.

they took a sample of these resistant bacteria to see what changed, why are they no longer affected by penicillin antibiotic, and they noticed that bacterias like N gonorrhoeae(sexualy transmitted disease) has changed the configuration of its membrane in a way that penicillin can no longer affect it. in 1928 N gonorrhoeae was perfectly curable by penicilin, now about 98% of these bacterias are resistant other bacterias have develloped a special enzyme( called beta lactamase) to degrade the antibiotic beta lactam ring(the weapon that antibiotic use to kill a bacteria) before it can reach it

this did not exist normaly 100 years ago, aslan why would a bacteria normaly have beta lactamase enzymes in nature?

look at it in the human direction, if a nuclear war starts and radiation filles the planet everywhere, the only animals and humans who will survive are the ones that happen to have resistance to radiation, so while billions die of radiation, a few minorities will live and will be left with all the gold, all the houses and all of the earth to populate and rule(same happened for the bacterias in your body) years afterwards the resistance characteristic will be reinforced and you'll have a new specie of humans

Evolution is the answer to everything in the Universe. Everything evolves to become better, more adaptable, and more efficient.

Mr J gave an awesome explanation, but, i would like to add another example which does not involve human intervention (ie antibiotics and nuclear weapons). Giraffes had short necks all those millennia ago, but a shortage in short bushes in the savannas made only the ones tall enough to feed off the trees survive. These mated and produced offspring, some of which shared the characteristic long neck. They survived and their consequent generations had the gene more expressed, giving us the modern giraffe.

Evolution is the explanation to all Biological concepts. From life's origins to a cell's membrane, evolution justifies it all.

The sad thing however, is that Biology is the only branch of science to have adopted evolution as an irrefutable truth so far. Physics, Chemistry, even newer fields such as Psychology still need to understand that even abstract things such as emotions and spirituality are all really adaptations to our world.

Charles Darwin was a brilliant scientist whose theory has stood for 150 years despite never-ending and vicious attempts to disprove it. But fact is, we are still evolving, everything is, always has, always will be.

Maybe giraffes and humans are a bit impractical to study and rely on intelligent conclusions rather than observable facts. Microbiology is the perfect example of evolution at its best and worst. Bacteria and viruses evolve at an alarmingly fast rate, which makes them so hard to deal with.

The problem is unnecessary and excessive use of antibiotics has led the resistant strains to evolve. Whenever someone sneezes, they binge down antibiotics to avoid a the common cold. In the past, antibiotics were used in a controlled manner by a qualified physician, today, ABs are like candy. Now, these resistant strains are not unbeatable, but they take much harsher treatment or even novel treatments.

The perfect example is HIV. Its extremely consistent and rapid evolution rate makes it hard to track and destroy it. A more common example we can relate to is the flu. Influenza viruses are notoriously diverse and very easily evolve into new strains, which is why we still get the cold despite the flu shot which immunizes us against thousands of strains.

The recent H1N1 outbreak revealed how widespread the bad idea of prevention through ABs is among people. US citizens flocked to pharmacies to stock up on Tamaflu to prevent their contraction of the sometimes deadly virus. This, other than the fact it is a selfish act which might deprive those in need of treatment from the drug, is foolish and will promote the evolution of this recent H1N1 strain into a 'superbug'. After all, if it infects a body with tamalfu in the system, the virus will not distinguish between the presence of the drug and the normal environment of the body. For the ABs attack antigens these pathogens present on host cells, rather than the virus itself.

Anyway, i think we went way off-topic... =P