Evolution in its basic definition, is change through time. Evolution of Live is the change organisms undergo over time.
Evolution does not necessarily mean that an organism has changed to a totally different one. The bacteria becoming more resistant to antibiotics have undergone Genetic change that enabled them to resist those antibiotics. In basic terms, the bacteria 'evolved' to fight against antibiotics, that is the term Evolution scientists refer to.
How we came to be can be explained through Evolution. Having the ability to see the light spectrum gives one a bigger advantage than those who have limited eyesight, but those with limited eyesight develop other means to make up for the lower eyesight (use of sonar for example).
Evolution doesn't necessarily mean that you get life from inanimate objects. Though scientists were able to produce organic compounds (amino acids) using non animate substances (elements like Oxygen, Hydrogen, Carbon etc.). This was done with the Miller-Urey Experiment, different compounds were used as well and still brought similar (if not better results).
Like I said before, there are many evidences that indicate Evolution of Life is a viable explanation. This website just explains the basics about Evolution: http://anthro.palomar.edu/evolve/evolve_3.htm
And an interesting video about genes and conducting of experimentation that validates Evolution: http://www.pbs.org/wgbh/evolution/libra ... 34_04.html
Enjoy!
Cheers
Yanoda