Which of the following is an example of genetic drift?

an earthquake kills 90 percent of the green beetles in a population of green, brown, and black beetles.
a green beetle travels from its population into a new population of entirely brown and black beetles.
green beetles have better camouflage than brown and black beetles and are not eaten as often by predators.
warm temperatures causes green, brown, and black beetles to start reproducing earlier than normal.

An earthquake kills 90 percent of the green beetles in a population of green, brown, and black beetles.

Explanation:

Genetic drift is one of the evolutionary agents and causes changes in allele frequency of the gene pool of the population by a change event. it does not involve any gene flow or natural selection. Among the given examples, the death of 90% green beetles by an earthquake leading to reduced frequency of the green allele in the gene pool is an example of genetic drift.

the electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, x-rays, and gamma-rays.