How can Bacteria help to prove Evolution?

-Bacteria, like every other Organism, can have Random Mutations which means New Variants. -One of the new Variants can be a certain Resistance made to an Particular Antibiotic, which is huge -This means if that Antibiotic is used, the Resistant Bacteria will Survive, but the other Bacteria won't so that means it can take a Greater Proportion of the Next Generation, and so fourth -This is literally also Natural Selection at its best as well -And because of the speed of Bacteria reproducing, Scientists can see it evolving, as its Doing just that