Which of the following describe examples where the mechanism of evolution was genetic drift? A few ground squirrels use a fallen log to cross a river that divides two populations

A rock slide kills some of the lizards in a desert population

Lava flowing from a volcanic eruption in Hawaii separates a population of fish into two newly-formed bays

A group of squirrels float on a raft of debris from northern Missouri to southern Arkansas during a major flood on the Mississippi River

Drought conditions cause trees that do not have sufficiently deep root systems to die off