DRIVING EVOLUTION. “Transposons are also the raw material of evolution. When these mobile elements move around in eggs and sperm, they can increase genetic diversity….transposons have contributed to human success by speeding our unusually rapid evolution, especially evolution of our big brains.”
https://www.geneticliteracyproject.org/2014/08/05/how-much-of-human-dna-is-doing-something/