A)
The most obvious example is the way microbes evolve to become resistant to antibiotics and other anti-microbial treatments.
That may not affect everyone's daily life, but it should at least give you pause before buying products that brag about their antibiotic qualities (unless you're actually buying medicine to treat a bacterial infection). The more we hit bacteria with antibiotics, the more likely it is that we'll see more and more "superbugs" that antibiotics can't treat anymore.
B)
Darwin's Theory motivates us to be adjusting and change our behaviour and mannerisms along with the changing environment. A person who does not adapt lags behind and is ultimately shuffled out.
In carrying on one's work, there should be complete dedication, earnestness and capacity to learn and adapt inorder to do a task well.