DEEP VESTIGIAL STRUCTURES. “Vestigial features of humans and other organisms are well known and have long been used as key evidence for evolution. Such features include not only anatomical structures but also physiological processes, biochemical reactions, and even behaviors.” Not to mention transposons derived from ancient viruses that dominate genomes.
http://evolution-outreach.springeropen.com/articles/10.1186/s12052-014-0012-5