Which is the best example of natural selection? some insects in a population survive

Best answer is: 
Some insects in a population survive temperature changes and pass their traits on to their offspring

Natural selection is the slow process by which the fittest animals, meaning the animals most fit to survive and reproduce in their environment, pass on the genes because of these advantages. The insects that cans survive temperature changes demonstrate a fitness in their environment, which results in passing on these traits. 

a

Explanation:

Drift leads to an increase in homozygosity for diploid organisms and causes an increase in the inbreeding coefficient. Drift increases the amount of genetic differentiation among populations if no gene flow occurs among them. Genetic drift also has two significant longer-term evolutionary consequences.