The Everly Brothers â Rolling Stone labeled the Everly Brothers the most important vocal duo in rock, having influenced the Beatles, the Beach Boys, Simon & Garfunkel and many other acts. Here, with Phil on the left, they perform on the Johnny Cash Show in 1970.
(plural glacial drifts) (geology) An accumulation of earth and rock which have been transported by moving ice, land ice, or icebergs.
Genetic Drift Defined. Populations of organisms are constantly changing and adapting to their environment. Drastic changes in environmental conditions can sometimes cause drastic changes to the gene pool of the population. Genetic drift is when chance events cause changes in frequencies of alleles in a population. Alleles are the genetic variations in a population, and they are the driving force behind the evolution of that population. The smaller the population, the greater the impact genetic drift will have.