Favorable Mutations? Help me!!

I know that there are many people debating if there is such thing as a "positive mutation." I have been researching this topic for only an hour for a class, and I have been able to learn only a few things, which seem to be opinions...1.Mutations may have favorable traits but are there are never any completely positive mutations.2.The traits of mutations may be favorable or unfavorable depending on the environment that the mutations have occurred in.I was wondering if anyone would be willing to help me out by giving your opinions here. I would also love any examples of "positive mutations" if you believe there is such a thing, or if you don't tell me why there aren't pos. mutations!So far I have gotten very vague information about sickle cell, Lactose tolerance, and Resistance to atherosclerosis.I just started biology 3 weeks ago, so try to keep it simple for now!!THANKS!!!!!!!------------------
I'm just a little girl--teach me more!!

I'm a freshman

No, at West Virginia University------------------
I'm just a little girl--teach me more!!

Does that bacterium that eats the waste in Japan actually help get rid of the waste completely?Thanks for the examples, keep em comin! ------------------
I'm just a little girl--teach me more!!

Great link! Thanks! I was actually looking at the pos. mutations stuff for my anthropology class, but that cleared up a few things for me that we are studying in biology. Again, thanks!!------------------
I'm just a little girl--teach me more!!

Also, that link had a link at the bottom of the page with information on "pos mutations"------------------
I'm just a little girl--teach me more!!