In biology, evolution is the change in how common heritable traits are in a population from generation to generation. This is usually measured in terms of the variant genes, known as alleles, that encode the traits. As differences in and between populations accumulate over time, speciation, the development of new species from existing ones, can occur. All known organisms are related by common descent through numerous speciations from a single ancestor.[1][2]
http://en.wikipedia.org/wiki/Evolution
We are rapidly changing all the time.