Genetic drift is defined as

A. That instead of sudden catastrophic events Slow constant processes formed these feature of earth

B that some individuals are better suited to survive their surroundings and therefore to live long enough to reproduce is the basis for natural selection

C. The physical and behavioral characteristics that an organism develops to survive in its environment

D. Random changes in Allele frequencies in a population it is not caused by evolutionary forces such as natural selection or mutation — it occurs completely by chance